Added LinkBlock functionality in admin

• Added:
- LinkBlock functionality in admin

app/policies/link_block_policy.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class LinkBlockPolicy < ApplicationPolicy
+  def index?
+    admin?
+  end
+
+  def create?
+    admin?
+  end
+
+  def destroy?
+    admin?
+  end
+end