Better monorepo directory organization

[oneminch]

I'd like to propose a more familiar monorepo structure.

My suggestion is to put the libraries (layer and cli) in a packages folder and the rest (docs, starters and playground) in an apps folder. I think this makes it easier for new comers to better understand the structure as well:

docus/
  apps/
    docs/
    playground/
    starters/
  packages/
    cli/
    layer/
  package.json
  pnpm-workspace.yaml
  ...
  README.md

[HugoRCD]

I’d also be in favour of switching to a more “traditional” monorepo structure, wdyt @larbish?