feat: great JS docs update for 1.3.70 (JetBrains#1605)

* use md5 digest instead of timestamp as asset version

* chore: remove package name from sample

* Add ID to "Why Kotlin?" section

This allows people to link to https://kotlinlang.org#why-kotlin

* Fixup heading copy

via #kotlin-web-site
https://jetbrains.slack.com/archives/CCQSCT8F6/p1580756473020100

* chore: Native tutorials cleanup (JetBrains#1560)

* Changed title for Hands-On

* Converted basic example to How-To and cleaned up contents.

* Split tutorials into separate HowTos

* Renamed to be in sync with other HowTos

* Added file for redirect.

* Update to navigation

* Minor correction of description

* Added How To on Using Gradle.

* Mentioned how to open project in IDE

* Added sample for Using IntelliJ IDEA

* Fixed broken links to kotlin native basic tutorial

* fix: broken links

* fix: broken links

* Worked in suggestions from PR.

* Moved Intro sample lower down in menu and renamed to proper title.

* chore: minor fixes and additions

* fix: broken links

Co-authored-by: Pavel Semyonov <[email protected]>

* chore(index): words with capital char earlier

* chore(index): add anchor icon for `why kotlin`

* chore (talks): February-April

* fix: typo in collection write operations (JetBrains#1579)

* chore(index): new kotlinconf 2020 banner

* Revert "chore(index): new kotlinconf 2020 banner"

This reverts commit cd1492a.

* chore: clarify sentence in properties.md (JetBrains#1581)

* Update properties.md

Grammatical correction of the 1st sentence of "Compile-Time Constants". 
Proposition -
"Properties the value of which is known at compile time ... " -> "Property values which are known at compile time .... "

* Update pages/docs/reference/properties.md

Co-Authored-By: Pavel Semyonov <[email protected]>

Co-authored-by: Pavel Semyonov <[email protected]>

* last news: Ktor 1.3

* feat(index): add logos for highlights

* chore: NPM deps in top-level dependencies block

* chore(index): remove old landing

* feat(index): add techs links

* JS-11959 Update kotlinlang.org home page

* chore(index): replace data-science icon

* chore(index): replace server-side icon

* fix: Inter font loading fix

* chore(index): normalize why section

* fix: broken redirect from old K/N tutorial

* fix: 404 on old K/N tutorials (JetBrains#1590)

* fix: broken redirect from old K/N tutorial

* fix: broken redirect from old K/N tutorials

* fix

* fix: tutorial link in native-overview.md (JetBrains#1586)

* Update native-overview.md

Link [A basic Kotlin/Native application](https://kotlinlang.org/docs/tutorials/native/basic-kotlin-native-app.html) is broken (404)

* refactor: comments resolve

* chore: update server-overview.md with Micronaut (JetBrains#1490)

Micronaut is a young prospect in the league of server-side frameworks, offering modern features and outstanding performance out of the box. I think the documentation should mention it, that's why I made this PR.

* last news: Ktor 1.3 replaces coroutines

* feat: add kotlin heroes link

* chore: K/JS custom distribution path

* chore: better formatting in examples

* Update links for Sydney Kotlin UG

* fix: Hyderabad KUG info update

* fix: typo in building-mpp-with-gradle.md (JetBrains#1593)

* feat: new DCE configuration

* chore: remove experimentality warning from DCE

* feat: add new Kotlin/JS how-tos (JetBrains#1602)

* feat: JS docs cleanup: hide outdated parts, arrange remaining

* fix: outdated tutorial warnings

* fix: JS docs bugfix + some extenstion

* fix: broken link

* fix: remove outdated instruction

Co-authored-by: hltj <[email protected]>
Co-authored-by: kb.chernenko <[email protected]>
Co-authored-by: Chris Parton <[email protected]>
Co-authored-by: Dmitry Konchalenkov <[email protected]>
Co-authored-by: Hadi Hariri <[email protected]>
Co-authored-by: Subhojit Som <[email protected]>
Co-authored-by: Roman Korostenskyi <[email protected]>
Co-authored-by: adamkobor <[email protected]>
Co-authored-by: Mike <[email protected]>
Co-authored-by: Joe Goodall <[email protected]>
Co-authored-by: Sebastian Aigner <[email protected]>

Author: 12 people

assets/fonts/Inter/Inter-Black.woff

@@ -358,20 +358,26 @@ tutorials:
       content:
         - url: /docs/tutorials/javascript/kotlin-to-javascript/kotlin-to-javascript.html
           title: Kotlin to JavaScript
-        - url: /docs/tutorials/javascript/getting-started-gradle/getting-started-with-gradle.html
-          title: Getting Started with Gradle
-        - url: /docs/tutorials/javascript/getting-started-idea/getting-started-with-intellij-idea.html
-          title: Getting Started with IntelliJ IDEA
-        - url: /docs/tutorials/javascript/getting-started-maven/getting-started-with-maven.html
-          title: Getting Started with Maven
-        - url: /docs/tutorials/javascript/getting-started-command-line/command-line-library-js.html
-          title: Creating a Kotlin JavaScript library with the Command Line Compiler
+        - url: /docs/tutorials/javascript/setting-up.html
+          title: Setting up a project
+        - url: /docs/tutorials/javascript/running-kotlin-js.html
+          title: Running Kotlin/JS
+        - url: /docs/tutorials/javascript/dev-server-continuous-compilation.html
+          title: Development Server and Continuous Compilation
+        - url: /docs/tutorials/javascript/using-packages-from-npm.html
+          title: Using packages from npm
+        - url: /docs/tutorials/javascript/debugging-kotlin-in-browser.html
+          title: Debugging Kotlin in the browser
+        - url: /docs/tutorials/javascript/running-tests.html
+          title: Running tests
+        - url: /docs/tutorials/javascript/browser-api-dom.html
+          title: Browser API and the DOM
+        - url: /docs/tutorials/javascript/typesafe-html-dsl.html
+          title: Typesafe HTML DSL
         - url: /docs/tutorials/javascript/working-with-modules/working-with-modules.html
           title: Working with Kotlin and JavaScript Modules
         - url: /docs/tutorials/javascript/working-with-javascript.html
-          title: Working with JavaScript
-        - url: /docs/tutorials/javascript/debugging-javascript/debugging-javascript.html
-          title: Debugging Kotlin in browser
+          title: Working with JavaScript libraries
         - url: /docs/tutorials/javascript/react-and-kotlin-js.html
           title: Building Web Applications with React and Kotlin/JS
 
@@ -386,10 +392,14 @@ tutorials:
 
     - title: Native
       content:
+        - url: /docs/tutorials/native/using-command-line-compiler.html
+          title: Hello Kotlin/Native using Command Line Compiler
+        - url: /docs/tutorials/native/using-gradle.html
+          title: Hello Kotlin/Native using Gradle
+        - url: /docs/tutorials/native/using-intellij-idea.html
+          title: Hello Kotlin/Native using IntelliJ IDEA
         - url: /docs/tutorials/native/intro-to-kotlin-native.html
-          title: Introduction to Kotlin/Native
-        - url: /docs/tutorials/native/basic-kotlin-native-app.html
-          title: Basic Kotlin/Native Application
+          title: Creating an HTTP Client in Kotlin/Native
         - url: /docs/tutorials/native/mapping-primitive-data-types-from-c.html
           title: Mapping Primitive Data Types from C
         - url: /docs/tutorials/native/mapping-struct-union-types-from-c.html

assets/fonts/Inter/Inter-Black.woff2

@@ -1,11 +1,10 @@
-- title: Making Kotlin Ready for Data Science
+- title: "Making Kotlin Ready for\xA0Data Science"
   link: https://blog.jetbrains.com/kotlin/2019/12/making-kotlin-ready-for-data-science/
 
-- title: Coroutines are now stable
-  link: /docs/reference/coroutines-overview.html
-  tag: What’s new
+- title: Ktor 1.3 Release
+  link: https://blog.jetbrains.com/kotlin/2020/01/ktor-1-3-release/
 
-- title: What to expect in Kotlin 1.4
+- title: "What to expect in Kotlin\xA01.4"
   link: https://blog.jetbrains.com/kotlin/2019/12/what-to-expect-in-kotlin-1-4-and-beyond/
 
 - title: KotlinConf 2019 Talks

assets/fonts/Inter/Inter-BlackItalic.woff

@@ -1,13 +1,9 @@
-- company: Pinterest
-  text: Pinterest has successfully <a target="_blank" href="https://www.youtube.com/watch?v=mDpnc45WwlI">introduced Kotlin</a> into their application, used by 150M people every month
 - company: Gradle
   text: Gradle is <a target="_blank" href="https://blog.gradle.org/kotlin-meets-gradle">introducing Kotlin</a> as a language for writing build scripts
-- company: Evernote
-  text: Evernote recently <a target="_blank" href="https://blog.evernote.com/tech/2017/01/26/android-state-library/">integrated Kotlin</a> into their Android client
-- company: Uber
-  text: Uber team <a target="_blank" href="https://www.reddit.com/r/androiddev/comments/5sihp0/2017_whos_using_kotlin/ddfmkf7/">uses Kotlin</a> for building internal tools
 - company: Corda
   text: Corda is an open-source distributed ledger platform, supported by major banks, and <a target="_blank" href="https://www.corda.net/2017/01/10/kotlin/">built entirely in Kotlin</a>
+- company: Evernote
+  text: Evernote recently <a target="_blank" href="https://blog.evernote.com/tech/2017/01/26/android-state-library/">integrated Kotlin</a> into their Android client
 - company: Coursera
   text: Coursera Android app is <a target="_blank" href="https://building.coursera.org/blog/2016/03/16/becoming-bilingual-coursera/">partially written</a> in Kotlin
 - company: Pivotal

assets/fonts/Inter/Inter-BlackItalic.woff2

@@ -1,15 +1,15 @@
 - title: Concise
-  description: Drastically reduce the amount of boilerplate code.
+  description: Drastically reduce the amount of boilerplate code
   content_file: concise.md
 
 - title: Safe
-  description: Avoid entire classes of errors such as null pointer exceptions.
+  description: Avoid entire classes of errors such as null pointer exceptions
   content_file: safe.md
 
 - title: Interoperable
-  description: Leverage existing libraries for the JVM, Android, and the browser.
+  description: Leverage existing libraries for the JVM, Android, and the browser
   content_file: interoperable.md
 
 - title: Tool-friendly
-  description: Choose any Java IDE or build from the command line.
+  description: Choose any Java IDE or build from the command line
   content_file: tooling.md

assets/fonts/Inter/Inter-Bold.woff

@@ -14,6 +14,7 @@
 from flask import Flask, render_template, Response, send_from_directory, request
 from flask.helpers import url_for, send_file, make_response
 from flask_frozen import Freezer, walk_directory
+from hashlib import md5
 
 from src.Feature import Feature
 from src.github import assert_valid_git_hub_url
@@ -49,11 +50,18 @@
 _nav_cache = None
 _nav_lock = threading.RLock()
 
+_cached_asset_version = {}
+
 def get_asset_version(filename):
+    if filename in _cached_asset_version:
+        return _cached_asset_version[filename]
+
     filepath = (root_folder if  root_folder  else ".") + filename
     if filename and path.exists(filepath):
-        file_stat = os.stat(filepath)
-        return str(file_stat.st_mtime)
+        with open(filepath, 'rb') as file:
+            digest = md5(file.read()).hexdigest()
+            _cached_asset_version[filename] = digest
+            return digest
     return None
 
 def get_site_data():
@@ -241,15 +249,6 @@ def index_page():
                            features=features
                            )
 
-@app.route('/index_old.html')
-def index_page_old():
-    features = get_kotlin_features()
-    return render_template('pages/index_old.html',
-                           is_index_page=True,
-                           features=features
-                           )
-
-
 def process_page(page_path):
     # get_nav() has side effect to copy and patch files from the `external` folder
     # under site folder. We need it for dev mode to make sure file is up-to-date