Theme: Hygiene

[pepopowitz]

This represents a collection of issues related to the theme of hygiene.

Tasks

Beta Give feedback

1. https://github.com/camunda/developer-experience/issues/275
2. Update dependencies #3735
   dx kind/cleanup theme:hygiene +3
   
3. Prepare for docusaurus v3 #2719
   dx kind/cleanup theme:hygiene +3
   
4. Update docusaurus to v3+ #3736
   dx kind/enhancement theme:hygiene +3
   
5. ------ urgency waterline: things above are for now, things below are for later ------
6. Add redirect for docs.camunda.io/docs to docs.camunda.io #3484
   dx theme:hygiene +2
7. Remove canonical dead-ends #2629
   component:docs dx theme:hygiene +3
   
8. What should we do with old redirect rules? #1397
   component:docs dx theme:hygiene +3
   
9. Remove sidebar-schema.js files from non-next versions #3027
   component:docs dx theme:hygiene +3