feat: replace hardcoded navigation with CMS-managed models
Replace static nav/footer links with Wagtail-managed NavigationMenuItem
and SocialMediaLink orderables on SiteSettings. Unpublished pages are
automatically excluded from rendering, fixing the dead-link problem.
- Extend SiteSettings with site_name, tagline, footer_description,
copyright_text branding fields
- Add NavigationMenuItem orderable (link_page/link_url, show_in_header,
show_in_footer, sort_order) with automatic live-page filtering
- Add SocialMediaLink orderable with platform icon templates
- New template tags: get_nav_items, get_social_links
- Update nav.html and footer.html to render from CMS data
- Data migration seeds existing hardcoded values for zero-change deploy
- Update seed_e2e_content command for test/dev environments
- 18 new tests covering models, template tags, and rendered output
Closes #32
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
1c5ba6cf90