We previously had a convention of redundantly including the directory
in relative links to reduce mistakes when moving content from one file
to another. However, these days we have a broken link checker in
test-documentation, and after #21237, MyST-Parser will check relative
links (including fragments) when you run build-docs.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
We're migrating to using the cleaner zulip.com domain, which involves
changing all of our links from ReadTheDocs and other places to point
to the cleaner URL.
Move docs/tutorials/documenting-api-endpoint.md to
docs/documentation/api.md.
This makes it easier to find when browsing the complete set of
materials on writing Zulip documentation.