Tidy up homepage and navigation

db/migrate/20251108042936_create_default_dsn.rb

@@ -0,0 +1,20 @@
+class CreateDefaultDsn < ActiveRecord::Migration[8.1]
+  def change
+    reversible do |dir|
+      dir.up do
+        # Only create if no DSNs exist
+        if Dsn.count == 0
+          Dsn.create!(
+            name: 'Development DSN',
+            key: 'dev-test-key-1234567890abcdef',
+            enabled: true
+          )
+        end
+      end
+      dir.down do
+        # Remove the default DSN if it exists
+        Dsn.where(key: 'dev-test-key-1234567890abcdef').delete_all
+      end
+    end
+  end
+end