Create new documentation on project structure

[jazeved0]

Checklist

• [ ] Re-do README for root directory
  • [ ] Include recommended VS Code plugins
  • [ ] Include how to open in VS Code to use workspace
  • [ ] Add READMEs for each sub-directory
• [ ] Add meta-documentation about:
  • [ ] Updated authoring info
  • [ ] Project structure
  • [ ] Tooling (eslint/prettier/editorconfig/gatsby/github actions)
  • [ ] Reasoning for structure/benefits/drawbacks