Add Registry to navigation menu

[kaxil]

Summary

Adds a "Registry" link to the navigation bar in two places:

1. Hugo main website — new [[menu.main]] entry in config.toml at weight 12, placing it between Documentation (10) and Roadmap (15)
2. Sphinx Airflow Theme — adds Registry to the default navbar_links in __init__.py

Verified locally

Built the site with site.sh preview-landing-pages and confirmed Registry appears in the navbar:

Menu order: Community, Meetups, Documentation, Registry, Use Cases, Announcements, Blog, Airflow Survey 2025, Ecosystem

Note

The Sphinx theme default in __init__.py is a fallback — production Airflow docs override navbar_links via conf_constants.py in the airflow repo. A follow-up PR there will add Registry to the full docs navbar.

[mik-laj]

Thank you very much for this project!

However, I noticed something on the registry providers page at https://airflow.staged.apache.org/registry/providers/ - the sorting field indicates that providers are sorted by 'Most Downloads', but they actually appear to be sorted alphabetically instead.

Is this expected behavior? It's a bit confusing as the UI suggests one sorting method but the actual order doesn't match.

[kaxil]

Thank you very much for this project!

However, I noticed something on the registry providers page at https://airflow.staged.apache.org/registry/providers/ - the sorting field indicates that providers are sorted by 'Most Downloads', but they actually appear to be sorted alphabetically instead.

Is this expected behavior? It's a bit confusing as the UI suggests one sorting method but the actual order doesn't match.

Thanks @mik-laj , Fixed in apache/airflow#63764