Nx: core: implement json schema for workspace.json/provide docs

[Hotell]

Current Behavior

Currently there are no proper api docs regarding workspace.json config.
Also there is deviation between web/react nx cli guides, as for web there is a commented section because of missing component schematic 😅(https://github.com/nrwl/nx/blob/master/docs/web/guides/cli.md)

Feature request:

• It would be nice to have similar docs like angular cli has
• ship JSON schema for workspace (proper intellisense and source of truth for docs)

[FrozenPandaz]

Hi, sorry about this.

This was mislabeled as stale. We are testing ways to mark _not reproducible_ issues as stale so that we can focus on actionable items but our initial experiment was too broad and unintentionally labeled this issue as stale.

[sushruth]

Also would be nice to have the same for nx.json as well.