Add link to TrueNAS tutorial

Author: m3nu

setup/databases.md

@@ -1,6 +1,6 @@
 ---
 title: Backup Databases
-nav_order: 7
+nav_order: 8
 layout: page
 parent: Setup
 description: "How to back up MySQL, MariaDB or Postgres using Borg Backup?"

setup/import.md

@@ -1,6 +1,6 @@
 ---
 title: Import and Export Repositories
-nav_order: 6
+nav_order: 7
 layout: page
 parent: Setup
 description: "How can I import or export existing repository data into BorgBase?"

setup/true-nas.md

@@ -0,0 +1,10 @@
+---
+title: TrueNAS
+nav_order: 6
+layout: page
+parent: Setup
+description: "Set up Borg Backup on TrueNAS"
+---
+# Set up Borg Backup on TrueNAS
+
+See [here](https://runby.coffee/backing-up-truenas-with-borg/) for a tutorial on backup up a TrueNAS file server to BorgBase. Written by [Glib Goat](https://twitter.com/GlibGoat).