add styleguide

mkdocs.yml

@@ -26,9 +26,9 @@ theme:
     search: 83   # s
 
 nav:
-#  - Styleguide: 'styleguide.md'
   - Maps: maps.md
 #  - Maschinenraum: 'maschinenraum.md'
 #  - Workadventure: 'workadventure.en.md'
   - Play: 'play.md'
+  - Styleguide: 'https://style.rc3.world'
 #  - Sponsoring: 'sponsoring.md'