Revamp Snaps docs IA

[alexandratran]

This PR updates the Snaps information architecture for more intuitive and feature-oriented categorization, and restructures and edits content as needed.

See the layout on Figma for more information. Fixes #1053.

Preview: https://docs.metamask.io/1053-snaps-ia-revamp/snaps

[github-actions]

Preview published: 1053-snaps-ia-revamp

[Montoya]

This seems like a better IA. I want to review it with the Snaps engineers before approving though.

[Mrtenz]

Can you make everything expanded by default, like how it was previously?

[github-actions]

Preview published: 1053-snaps-ia-revamp

[alexandratran]

@Mrtenz Can you re-review?

[Mrtenz]

Maybe these should be expanded too? And potentially moved to top level instead of "Learn"?

[github-actions]

Preview published: 1053-snaps-ia-revamp

[Montoya]

Maybe these should be expanded too? And potentially moved to top level instead of "Learn"?

The goal was to have the high level navigation based on what we came up with in Figma. If someone wants to learn about Snaps and how to build Snaps, they should have a place to go for that. If someone just needs reference information, they have a place go to for that too.

[alexandratran]

@Mrtenz I hesitate to have everything expanded all at once, because it can cognitively overload the reader. Perhaps once we improve and optimize the style of the sidebar (#1126), we can explore better ways to expand/hide information in the sidebar?

[bgravenorst]

Minor feedback

[github-actions]

Preview published: 1053-snaps-ia-revamp