docs: port to VitePress

Things that happen in this shameless squash:
- Removed 404 page
  - It doesn't work in VitePress and making it work in VitePress needs
    some invasive hack in the theme that I'm not willing to do
  - The default is more than enough, though
- Moved consoleVersionSelect include to another directory
  - This avoids being uploaded to Crowdin for translation
- Inline all SafeB9SInstaller includes
  - Not only do parameterized includes not work, but if/else statements
    don't work at all
- The sysupdate include parameter hasn't been used since MSET9, so it
  actually works just fine without any parameters. Hooray(?)
- Move mset9-chorus to an include, that logic doesn't work in VitePress
- Removed Get Started button from homepage, it breaks translations
- Tables in get-started are now shown by default; it seems VitePress really does
  not want us to use inline script. So we cannot enable it upon
  realizing that the browser is JS capable
- Include parameters are now in frontmatter to allow translation
- Hacked in a bunch of CSS values kanged from the old theme to make it
  look not stupid
- Drop headers down one level to make table of contents work

docs/restoring-updating-cfw.md

@@ -1,20 +1,16 @@
----
-title: "Restoring / Updating CFW"
----
+# Restoring / Updating CFW
 
-{% include toc title="Table of Contents" %}
-
-### Required Reading
+## Required Reading
 
 This page prepares consoles with an existing modern boot9strap installation for reinstallation and/or updating of custom firmware applications. It can also be used in the event of a lost or corrupted SD card.
 
 Your SD card must be formatted as FAT32 to follow this guide, or else the 3DS will be unable to recognize it. If your SD card is not yet properly formatted, use one of these pages to format it, depending on your operating system: [Windows](formatting-sd-(windows)), [Mac](formatting-sd-(mac)), [Linux](formatting-sd-(linux)).
 
-### What You Need
+## What You Need
 
 * The latest release of [Luma3DS](https://github.com/LumaTeam/Luma3DS/releases/latest) (the Luma3DS `.zip` file)
 
-### Instructions
+## Instructions
 
 1. Insert your SD card into your computer
 1. Copy `boot.3dsx` and `boot.firm` from the Luma3DS `.zip` to the root of your SD card, replacing any existing files
@@ -23,9 +19,16 @@ Your SD card must be formatted as FAT32 to follow this guide, or else the 3DS wi
 1. Power on your console
     + If you see the Luma3DS configuration menu, press (Start) to save and reboot
 
+::: tip
+
 The latest version of Luma3DS has now been installed on your SD card and on internal memory.
-{: .notice--success}
+
+:::
+
 ___
 
+::: info
+
 If you wish to re-install or update other homebrew applications, continue to [Finalizing Setup](finalizing-setup)
-{: .notice--primary}
+
+:::