- Updates `.prettierignore` for the new directory.
- Updates any reference to the API documentation directory for
markdown files to be `api_docs/` instead of `zerver/api/`.
- Removes a reference link from `docs/documentation/api.md` that
hasn't referenced anything in the text since commit 0542c60.
- Update rendering of API documentation for new directory.
These suffixes suppress some checks in the process, but still generate
and upload a tarball, push a tag, and make a Github prerelease.
`upload-release` already understands that anything with a suffix never
becomes the "latest" release.