🔧 Update example site config and overrides for v3

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

exampleSite/config/_default/menus.de.toml

@@ -39,7 +39,8 @@
   weight = 90
 
 [[main]]
-  name = "Merch"
+  identifier = "merch"
+  pre = "shirt"
   url = "https://www.teepublic.com/user/blowfish-store/t-shirts"
   weight = 100
 
@@ -49,6 +50,12 @@
   url = "https://twitter.com/burufugu"
   weight = 200
 
+[[main]]
+  identifier = "bluesky"
+  pre = "bluesky"
+  url = "https://bsky.app/profile/burufugu.bsky.social"
+  weight = 250
+
 [[main]]
   identifier = "github"
   pre = "github"