[docs reorganization] Reorganize Access Controls guides (#42806)

* Update host user groups for existing users (#41919)

This change fixes a bug in host user creation where Teleport would not
update the groups of a returning user if groups were changed in
the user's role.

* improve dynamodb permission error msg (#42855)

* improve dynamodb permission error msg

* Update lib/backend/dynamo/atomicwrite.go

Co-authored-by: Zac Bergquist <zac.bergquist@goteleport.com>

---------

Co-authored-by: Zac Bergquist <zac.bergquist@goteleport.com>

* Fix GCP metadata errors crashing Teleport (#42696)

* Web: Fix differing duration between unified resource and access request page (#42742)

* Web: refactor and fix anti-pattern in access request

* Update affected teleterm files

* Address CR and fix updating duration should update pending

* Fix test and stories

* Reorganize Access Controls guides

Move Access Controls giudes into References or Admin Guides, as
appropriate.

Also reorganizes the Admin Guides section to reduce the size of the
table of contents page.

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Co-authored-by: Andrew Burke <31974658+atburke@users.noreply.github.com>
Co-authored-by: Forrest <30576607+fspmarshall@users.noreply.github.com>
Co-authored-by: Zac Bergquist <zac.bergquist@goteleport.com>
Co-authored-by: Lisa Kim <lisa@goteleport.com>

docs/config.json

@@ -28,7 +28,7 @@
 	    },
 	    {
 	       "title": "Set up Single Sign-On",
-	       "slug": "/access-controls/sso/overview/"
+	       "slug": "/admin-guides/authentication/sso/overview/"
 	    },
 	    {
 	    	"title": "Use Infrastructure as Code",