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

---------

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

web/public/Clickup.svg

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web/public/Cohere.svg

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