Refining list categories

[whoabuddy]

Based on the comment in #6 and looking at the info we have now with the prospect of adding a lot more, this might be a good time to revisit the categories.

Currently, the structure is:

Learning
  Documentation
  Explanatory videos
  Podcasts
  Workshops
  Blog posts
Resources
  Inscriptions
Tools
  Creator tools
  Analytics
  Explorers
  Wallets
  Other
Official communities
Inscriptions
  Directories
Trading
  Non-custodial
  Custodial
Contributing
License

The other awesome list uses level 2 headings and the divider makes it much cleaner. Plus having one level of content makes the categories easier to understand.

e.g. Why have Resources > Inscriptions and Inscriptions > Directories? Should both be under inscriptions?

For comparison, the categories from the other list:

Ordinals Overview
Wallets
Exchanges / Marketplaces
Communities
Inscribe Tools
Directories
Art
Analytics
Tech
Genart projects
Early projects

Could also apply to #1 since this is closer to the recommended template based on instructions for creating your own.

fwiw probably worth leaving projects to external directories that can be updated more often, but otherwise I like the simplicity of that layout and think we should do something similar.

Any preferences or blockers? Happy to draft up a PR with this idea and continue adding more resources.