[DOCS] oxide.md main docs site suggestions

[adriangalilea]

This issue is meant to track the list of suggested changes to improve the docs hosted on https://oxide.md

TO-DO

• [x] Restore sidebar

removed v1 reference and the 'index' (got rid of nav bar lol)

@Feel-ix-343 how can we restore this?

• [x] Recommended links belong to the sidebar
• [ ] Every feature should be explained with text in addition to the current GIF
• [ ] Consider replacing GIF's with an actual proper video, as GIF often lack video controls and can't be seen in full screen.
• [x] Home should explain what markdown oxide is
  • [x] Remove: "This is the homepage for t..."
  • [x] This is the first thing that should appear
  • [x] There's no need for the Recommended links sections as they are on the sidebar now
  • [x] Optionally link to getting started right below answering What is Markdown-Oxide?

Original discussion: https://github.com/Feel-ix-343/markdown-oxide/issues/238