Tidy up homepage and navigation

db/migrate/20251108041801_create_dsns.rb

@@ -0,0 +1,12 @@
+class CreateDsns < ActiveRecord::Migration[8.1]
+  def change
+    create_table :dsns do |t|
+      t.string :key
+      t.string :name
+      t.boolean :enabled, default: true, null: false
+
+      t.timestamps
+    end
+    add_index :dsns, :key, unique: true
+  end
+end