[docs] Create separate workspace

[eps1lon]

BREAKING

- yarn workspace docs typescript:formatted
+ yarn workspace docs typescript:transpile

- yarn docs:typescript
+ yarn workspace docs typescript:transpile:dev

- yarn docs:typescript:check
+ yarn workspace docs typescript

- yarn docs:typescript:formatted
+ yarn workspace docs typescript:transpile

This will be a long living branch that's heavily rebased.

I've reached the point where the clashes between library and app have reached a level for me personally that warrants a refactor. This will be disrupting, it will hurt github blame but I'd hope we have a more focused repo in the end.

This is just a refactor so don't expect immediate features. The features this will enable are:

• focused CI/CD installs reducing install times for certain jobs (currently buggy in yarn v1)
• reduced top level scripts with yarn v2 (current script entries in package.json will become obsolete)

Refactoring improvements:

• reduce top level directories by 2
• separate dependencies (whats lib dev vs whats app code?)
• docs related "stuff" lives closer together
• clearer distinction between lib and app transpilation (next.js technically didn't allow the current way of setting presets)

I hope that the new layout will make it easier to debug why we can't esmodules in our docs.

Test plan:

• scripts

  • api
  • buld
  • build-sw
  • deploy
  • dev
  • export
  • icons
  • size-why
  • start
  • i18n
  • typescript
  • typescript:check
  • typescript:formatted

• successful deploys over time

[eps1lon]

Closing in favor of #16640

Azure didn't pick this up as well.