Add Five for the Future link to global footer (#619)

Replaces the Swag store link which has been removed while the store is closed.

Author: adamwoodnz

mu-plugins/blocks/global-header-footer/footer.php

@@ -91,6 +91,9 @@
 		<!-- wp:list-item -->
 		<li><a href="https://wordpressfoundation.org/donate/"><?php echo esc_html_x( 'Donate ↗', 'Menu item title', 'wporg' ); ?></a></li>
 		<!-- /wp:list-item -->
+		<!-- wp:list-item -->
+		<li><a href="https://wordpress.org/five-for-the-future/"><?php echo esc_html_x( 'Five for the Future', 'Menu item title', 'wporg' ); ?></a></li>
+		<!-- /wp:list-item -->
 	</ul>
 	<!-- /wp:list -->