Move Table of Contents

[avivkeller]

We've been collecting some feedback, and it appears that the table of contents (in-page, currently in the MetaBar) may not be very mobile-friendly, since the user needs to scroll all the way to the bottom of the page to access it.

Some other projects use various different layouts on mobile:

(Deno)

(MDN)

(Electron)

[bjohansebas]

[Astro]

[avivkeller]

@araujogui created a component. I'll add it here.