Techdocs: Updates preparers to make it work in actual usecases (#1957)

* feature(techdocs): JIT generation of techdocs

* Fix linting issues

* Add Techdocs tab to entity page

* Added missing dep

* Added missing dep

* Removed duplicate dep

* Better tab navigation

* Update label on entity page to say docs

* Fix lint issue

* Move building of docs from entity to a function

* feature(techdocs): JIT generation of techdocs

* Fix linting issues

* Add Techdocs tab to entity page

* Added missing dep

* Added missing dep

* Removed duplicate dep

* Better tab navigation

* Update label on entity page to say docs

* Fix lint issue

* Move building of docs from entity to a function

* attempt to add back react as a dep

* Fixed failing test

* fix(techdocs): Hopefully fixed tests

* Fixed another failing test

* Initial apiRef for techdocs storage

* Cleaned up some code in reader

* test(headertabs): add tests to HeaderTabs component

* fix(headertabs): change tab mock id

* fix(techdocs-generator): fix problem with macOS symlink to tmp folder

* fix(lint): remove unused configApiRef

* wip

* Ongoing cleanups

* Cleanups and fix tests

* Initial github preparer. Doesn't work properly yet

* Updated dir preparer to handle github managed-by-location and added github preparer

* Removed old file

* Fixed feedback and added better logging to techdocs build process

* Updated create-app template

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Emma Indal <emmai@spotify.com>

plugins/techdocs-backend/examples/documented-component/documented-component.yaml

@@ -4,7 +4,7 @@ metadata:
   name: documented-component
   description: A Service with TechDocs documentation
   annotations:
-    backstage.io/techdocs-ref: 'dir:./'
+    backstage.io/techdocs-ref: 'github:https://github.com/spotify/backstage/blob/master/plugins/techdocs-backend/examples/documented-component'
 spec:
   type: service
   lifecycle: experimental