add resources and collapse single-crate projects

[dawnofmidnight]

This PR does two things. First, it collapses the icons of single-crate projects into titles. Secondly, it adds a number of resources.

I'm not very good at writing summaries of a lot of these topics, so I've left the descriptions blank. I'd love some help with that.

There are also a few considerations to be made.

• Do we want to include compiler-adjacent projects, such as string interning?
• Do we want to include a list of resources? A lot of language development isn't exactly cut and paste, so including links to papers and guides may be beneficial.
  • This is likely outside of the scope of this PR.

[Legorooj]

• Imo yes, include the adjacent projects.
• Yeah this is probably a good idea, we can make a new section for learning resources.
• agreed, outside scope of this PR.

[Legorooj]

Looks good!