This PR removes the `/nx-api` pages from `nx-dev`. They are already
redirected from `/nx-api` to either `/technologies` or
`/reference/core-api` URLs.
e.g. `/nx-api/nx` goes to `/reference/core-api/nx` and `/nx-api/react`
goes to `/technologies/react/api`
**Changes**:
- Remove old `nx-api.json` from being generated in
`scripts/documentation/generators/generate-manifests.ts` -- this was
used to generate the sitemap
- Remove `pages/nx-api` from Next.js app since we don't need them
- Remove workaround from link checker
`scripts/documentation/internal-link-checker.ts` -- the angular
rspack/rsbuild and other workarounds are gone now that they are proper
docs in `map.json`
- Update Powerpack/Remote Cache reference docs to exclude API documents
(since they are duplicated in the Intro page) --
`nx-dev/models-document/src/lib/mappings.ts`
- All content in `docs` have been updated with new URL structure
**Note:** Redirects are already handled, and Claude Code was used to
verify the updated `docs/` URLs (see report below). The twelve 404s
links were updated by hand.
## Verification Report
https://gist.github.com/jaysoo/c7863fe7e091cb77929d1976165c357a
