fix: update gatsby monorepo (#17369)

Author: gatsbybot

.gitignore

@@ -0,0 +1,69 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# dotenv environment variables file
+.env
+
+# gatsby files
+.cache/
+public
+
+# Mac files
+.DS_Store
+
+# Yarn
+yarn-error.log
+.pnp/
+.pnp.js
+# Yarn Integrity file
+.yarn-integrity

.prettierrc

@@ -0,0 +1,7 @@
+{
+  "endOfLine": "lf",
+  "semi": false,
+  "singleQuote": false,
+  "tabWidth": 2,
+  "trailingComma": "es5"
+}

LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2019 Gatsbyjs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,89 @@
+<p align="center">
+  <a href="https://www.gatsbyjs.org">
+    <img alt="Gatsby" src="https://www.gatsbyjs.org/monogram.svg" width="60" />
+  </a>
+</p>
+<h1 align="center">
+  Starter for the official Gatsby blog core theme
+</h1>
+
+Quickly get started using the Gatsby blog core theme! This starter creates a new Gatsby site that is preconfigured to work with the [official Gatsby blog core theme](https://www.npmjs.com/package/gatsby-theme-blog-core), allowing you to get started creating a child theme quickly.
+
+## 🚀 Quick start
+
+1.  **Create a Gatsby site.**
+
+    Use the Gatsby CLI to create a new site, specifying the blog theme starter.
+
+    ```sh
+    # create a new Gatsby site using the blog theme starter
+    gatsby new my-themed-blog https://github.com/gatsbyjs/gatsby-starter-blog-theme-core
+    ```
+
+2.  **Start developing.**
+
+    Navigate into your new site’s directory and start it up.
+
+    ```sh
+    cd my-themed-blog/
+    gatsby develop
+    ```
+
+3.  **Open the code and start customizing!**
+
+    Your site is now running at `http://localhost:8000`!
+
+    To get started, check out the guide to [using the Gatsby blog theme starter](http://gatsbyjs.org/docs/themes/using-a-gatsby-theme), or the longer, [more detailed tutorial](http://gatsbyjs.org/tutorial/using-a-theme).
+
+## 🧐 What's inside?
+
+Here are the top-level files and directories you'll see in a site created using the blog theme starter:
+
+```
+gatsby-starter-blog-theme-core
+├── content
+│ ├── assets
+│ │ └── avatar.png
+│ └── posts
+│ ├── hello-world.mdx
+│ └── my-second-post.mdx
+├── .gitignore
+├── .prettierrc
+├── gatsby-config.js
+├── LICENSE
+├── package-lock.json
+├── package.json
+└── README.md
+```
+
+1.  **`/content`**: A content folder holding assets that the theme expects to exist. This will vary from theme to theme -- this starter is set up to get you started with the blog theme, which expects an image asset for your avatar, and blog post content. Replace the avatar image file, delete the demo posts, and add your own!
+
+2.  **`.gitignore`**: This file tells git which files it should not track / not maintain a version history for.
+
+3.  **`.prettierrc`**: This file tells [Prettier](https://prettier.io/) which configuration it should use to lint files.
+
+4.  **`gatsby-config.js`**: This is the main configuration file for a Gatsby site. This is where you can specify information about your site (metadata) like the site title and description, which Gatsby plugins you’d like to include, etc. When using themes, it's where you'll include the theme plugin, and any customization options the theme provides.
+
+5.  **`LICENSE`**: Gatsby is licensed under the MIT license.
+
+6.  **`package-lock.json`** (See `package.json` below, first). This is an automatically generated file based on the exact versions of your npm dependencies that were installed for your project. **(You won’t change this file directly).**
+
+7.  **`package.json`**: A manifest file for Node.js projects, which includes things like metadata (the project’s name, author, etc). This manifest is how npm knows which packages to install for your project.
+
+8.  **`README.md`**: A text file containing useful reference information about your project.
+
+## 🎓 Learning Gatsby
+
+Looking for more guidance? Full documentation for Gatsby lives [on the website](https://www.gatsbyjs.org/).
+
+Here are some places to start:
+
+### Themes
+
+- To learn more about Gatsby themes specifically, we recommend checking out the [theme docs](https://www.gatsbyjs.org/docs/themes/).
+
+### General
+
+- **For most developers, we recommend starting with our [in-depth tutorial for creating a site with Gatsby](https://www.gatsbyjs.org/tutorial/).** It starts with zero assumptions about your level of ability and walks through every step of the process.
+
+- **To dive straight into code samples, head [to our documentation](https://www.gatsbyjs.org/docs/).** In particular, check out the _Reference Guides_ and _Gatsby API_ sections in the sidebar.

content/assets/avatar.png

@@ -0,0 +1,31 @@
+---
+title: Hello World (example)
+date: 2019-04-15
+---
+
+Hello, world! This is a demo post for `gatsby-theme-blog`.
+
+Delete me, and get writing!
+
+```js:title=gatsby-config.js
+module.exports = {
+  plugins: [
+    "gatsby-theme-blog", // highlight-line
+    "gatsby-theme-notes"
+  ]
+};
+```
+
+This is another paragraph after the code block.
+
+## This is a secondary heading
+
+```jsx
+import React from "react";
+import { ThemeProvider } from "theme-ui";
+import theme from "./theme";
+
+export default props => (
+  <ThemeProvider theme={theme}>{props.children}</ThemeProvider>
+);
+```

content/posts/hello-world.mdx

@@ -0,0 +1,10 @@
+---
+title: My Second Post! (example)
+date: 2019-05-15
+---
+
+Wow! I love blogging so much already.
+
+Did you know that "despite its name, salted duck eggs can also be made from chicken eggs, though the taste and texture will be somewhat different, and the egg yolk will be less rich."? ([Wikipedia Link](http://en.wikipedia.org/wiki/Salted_duck_egg))
+
+Yeah, I didn't either.

content/posts/my-second-post.mdx

@@ -0,0 +1,8 @@
+module.exports = {
+  plugins: [
+    {
+      resolve: `gatsby-theme-blog-core`,
+      options: {},
+    },
+  ],
+}