add travel guide to navbar

mkdocs.yml

@@ -30,6 +30,7 @@ nav:
 #  - Maschinenraum: 'maschinenraum.md'
 #  - Workadventure: 'workadventure.en.md'
   - Play: 'play.md'
+  - Travel Guide: 'visit.md'
   - Styleguide: 'https://style.rc3.world'
   - Principles: 'rules.md'
 #  - Sponsoring: 'sponsoring.md'