docs: Move 'User Profiles & Authentication' to design docs

Signed-off-by: David Mehren <git@herrmehren.de>

backend/src/identity/identity.entity.ts

@@ -52,7 +52,7 @@ export class Identity {
 
   /**
    * If the identity should be used as the sync source.
-   * See [authentication doc](../../docs/content/dev/authentication.md) for clarification
+   * See [authentication doc](../../docs/content/dev/user_profiles.md) for clarification
    */
   @Column()
   syncSource: boolean;

docs/content/dev/design_docs/user_profiles.md

@@ -1,4 +1,9 @@
 # User Profiles and Authentication
+
+!!! info "Design Document"
+    This is a design document, explaining the design and vision for a HedgeDoc 2
+    feature. It is not a user guide and may or may not be fully implemented.
+
 Each user in HedgeDoc 2 has a profile
 which contains the following information:
 

docs/mkdocs.yml

@@ -23,7 +23,7 @@ nav:
     - '2.0 Development': dev/2.0.md
     - Design Documents:
       - Notes: dev/notes.md
-      - 'User Profiles & Authentication': dev/user_profiles.md
+      - 'User Profiles & Authentication': dev/design_docs/user_profiles.md
       - Configuration: dev/config.md
     - 'Writing Docs': dev/documentation.md
   - FAQ: https://hedgedoc.org/faq