If you're making changes to the help center files, be sure to test and provide screenshots in your pull request description. As with other code, untested documentation is often buggy.
./tools/run-dev --only-help-center.
./tools/run-dev --help-center-dev-server (requires more resources).
./tools/build-help-center followed by
./tools/run-dev --help-center-static-build. Hot reloads won't
work: rerun ./tools/build-help-center
and reload your browser to see updates. Search will not
work with other methods of running the help center.