Migrated all six service pages from Grav to Zola format:
- YAML frontmatter → TOML with weight and extra.anchor
- Grav image refs → {{ img() }} shortcode calls
- [fa=external-link /] → <i class="fa fa-external-link"></i>
- Linked image in HV page wrapped with <a href> HTML tag
Anchors HV, Corona, Vorsorge, Diagnostik, Kardio, Diabetologie match
the home page service grid links established in commit 9cf54f9.
- Extends base.html, uses shared image macro for resize_image
- Refactored img shortcode to forward to macros/image.html (DRY)
- News pulled via get_page from content/news.md
- Notfall section skipped (was unpublished in grav)
- Map call commented out until shortcode lands in Task 20
- main.scss imports the praxis theme partial
- Fix missing semicolon at line 1836 that SCSS strict mode rejected
- Bootstrap and mobile-menu remain separate <link> tags (loaded from /css/)