feat: add header & footer support on release notes page

Author: Muhammad Faraz Maqsood

src/release-notes/ReleaseNotes.jsx

@@ -1,5 +1,16 @@
 import React from 'react';
+import { StudioFooterSlot } from '@edx/frontend-component-footer';
 
-const ReleaseNotes = () => <h1>Welcome to release-notes!</h1>;
+import Header from '../header';
+
+const ReleaseNotes = () => (
+  <>
+    <Header isHiddenMainMenu />
+    <main className="page-content">
+      <h1>Welcome to release-notes!</h1>
+    </main>
+    <StudioFooterSlot />
+  </>
+);
 
 export default ReleaseNotes;