Add Authentik

Add Authentik to handbook. Deprecate PocketID, pointer to Authentik

docs/handbook/infrastructure/security/.nav.yml

@@ -1,4 +1,5 @@
 title: Security
 nav:
   - index.md
+  - authentik.md
   - pocket-id.md

docs/handbook/infrastructure/security/authentik.md

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+# Authentik
+
+authentik is an IdP (Identity Provider) and SSO (Single Sign On) platform that is built with security at the forefront of every piece of code, every feature, with an emphasis on flexibility and versatility.
+
+## Quick Reference
+**URL**: [:octicons-tab-external-16: sso.starcat.systems](https://sso.starcat.systems)  
+**Homepage**: [:octicons-link-external-16: goauthentik.io/](https://goauthentik.io/)  
+**Hosting**: [:octicons-arrow-right-16: Hetzner](../servers_and_hosting/hetzner.md) :flag_fi: `HEL1`  
+**Project group**: `SCsys_infra`  
+**Configuration repo**: [:simple-forgejo: starcat-infra/auth-server](https://git.starcat.systems/starcat-infra/auth-server)
+
+## Additional Information
+Please see the [:material-book-lock: Authentik](https://internal-handbook.starcatsys.net/infrastructure_apps/security/authentik/) page of the internal handbook for additional configuration and access information.

docs/handbook/infrastructure/security/pocket-id.md

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 # Pocket ID
 
+!!! deprecated "Deprecated"
+    **Pocket ID is deprecated and is no longer in use.**
+    
+    For up-to-date information, please see [:octicons-arrow-right-16: Authentik](authentik.md).
+
 Pocket ID is a simple and easy-to-use OIDC provider that allows users to authenticate with their passkeys to your services.
 
 ## Quick Reference