[v17] Expand the Policy description on the home page (#48178)

* Expand the Policy description on the home page

Closes #47135

Mention Crown Jewels and Policy integrations.

* docs: correct link for ssh keys scan

---------

Co-authored-by: Steven Martin <steven@goteleport.com>

docs/pages/index.mdx

@@ -102,10 +102,20 @@ Get started with Teleport Identity:
 ### Teleport Policy
 
 **Teleport Policy** unifies and controls access policies across all your
-infrastructure. With Teleport Policy’s Access Graph feature, you gain insights into role-based
-access control policies within Teleport and your cloud provider.
-
-Get started with [Teleport Policy](admin-guides/teleport-policy/teleport-policy.mdx).
+infrastructure. With Teleport Policy’s Access Graph feature, you gain insights
+into role-based access control policies within Teleport, your cloud providers,
+and critical infrastructure.
+
+- Get started with [Teleport
+  Policy](admin-guides/teleport-policy/teleport-policy.mdx).
+- Define [Crown Jewels](admin-guides/teleport-policy/crown-jewels.mdx) so you
+  can track changes to your most sensitive users and resources.
+- Enable [Teleport Policy
+  integrations](admin-guides/teleport-policy/integrations/integrations.mdx) so
+  you can identify [insecure SSH key
+  distributions](admin-guides/teleport-policy/integrations/ssh-keys-scan.mdx), and
+  import RBAC rules from AWS, Entra ID, and other sources to visualize your
+  entire RBAC configuration in on a single screen. 
 
 ## Architecture