Create registry_api_client_libraries.md
Signed-off-by: Konrad Kleine <konrad.wilhelm.kleine@gmail.com>
Add registry_api_client_libraries.md to mkdocs.yml

Signed-off-by: Konrad Kleine <konrad.wilhelm.kleine@gmail.com>
Typo: changed "Maintainers" to "maintainers"

Signed-off-by: Konrad Kleine <konrad.wilhelm.kleine@gmail.com>
Merge pull request #8336 from kwk/improve_docs_with_note_about_registry_frontend_web_app

Improve docs with note about registry frontend web app