Added LinkBlock functionality in admin

• Added:
- LinkBlock functionality in admin

app/models/concerns/link_normalizable.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module LinkNormalizable
+  extend ActiveSupport::Concern
+
+  included do
+    before_validation :normalize_link
+  end
+
+  private
+
+  def normalize_link
+    self.link = TagManager.instance.normalize_link(link&.strip)
+  end
+end