Cleanup branch directories.

Author: actions-user

index.html

@@ -18,6 +18,7 @@
 <li><a href="feature/store_and_provide_state_of_the_buttons"><code>feature/store_and_provide_state_of_the_buttons</code></a></li>
 <li><a href="first_menu_with_buttons"><code>first_menu_with_buttons</code></a></li>
 <li><a href="gh-pages"><code>gh-pages</code></a></li>
+<li><a href="improve-lvgl-gui-engine"><code>improve-lvgl-gui-engine</code></a></li>
 <li><a href="main"><code>main</code></a></li>
 <li><a href="temp/57-attempt-with-async"><code>temp/57-attempt-with-async</code></a></li>
 <li><a href="test/57-order-and-refactor-code-according-to-software-architecture"><code>test/57-order-and-refactor-code-according-to-software-architecture</code></a></li>