Doc: sidebar

[Wolfr]

Implement a sidebar layout for the docs.

This PR can be merged, this is already an improvement in the right direction.

• Mobile menu has been tested

To be fixed:

• Blog children are showing in the sidebar
• The third nav level (e.g. guide/installation/installation) is not showing in the sidebar

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[Wolfr]

Question @jakobrosenberg , if I set <!-- routify:options index=false --> on the blog pages, they disappear entirely. Can you check what is going on?

[Wolfr]

I've now set it up to use <svelte:self> but I could use some help @jakobrosenberg .

• Only show 3rd level nav when you are actually in the 2nd level item, otherwise the nav gets too busy
• Show the icons for Discord etc. (I need to pass the meta but I don't know how, the code is working in the commented out code at the bottom of NavItems.svelte, but that tree is not “recursive”)

[www-chique]

Hey, just wanted to show these. Ignore me if this is not an issue.
Browser: Firefox latest

1. Dual scrollbars on responsive / smaller screen.
   

2. With the menu opened, and scrolling down, the "X" close button scrolls along with the body. Would be better if it doesn't scroll.