Add new admin page (#1947)

* add admin page

* credential + typing fix

* rebase fix

* on add, cleaner buttons

* functional G + Ddrive

* organized auth sections

* update types and remove logs

* ccs -> connectors

* validated formik

* update styling + connector-handling logic

* udpate colors

* separate out hooks + util functions

* update to adhere to rest standards

* remove "todos"

* rebase

* copy + formatting + sidebar

* update statuses + configuration possibilities

* update interfaces to be clearer

* update indexing status page

* formatting

* address backend security + comments

* update font

* fix form routing

* fix hydration error

* add statuses, fix bugs, etc. (squash)

* fix color (squash)

* squash

* add functionality to sidebar

* disblae buttons if deleting

* add color

* minor copy + formatting updates
- on modify credential, close
- update copy for deletion of connectors

* fix build error

* copy

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Co-authored-by: Yuhong Sun <yuhongsun96@gmail.com>

backend/tests/regression/answer_quality/api_utils.py

@@ -166,6 +166,7 @@ def create_connector(env_name: str, file_paths: list[str]) -> int:
         refresh_freq=None,
         prune_freq=None,
         disabled=False,
+        indexing_start=None,
     )
 
     body = connector.dict()