Closes #11: github icon with link in the footer

Author: zafar-saleem

assets/github.png

@@ -101,6 +101,7 @@ <h4 class="title-last">to different tools.</h4>
       <li><a href="mailto:[email protected]">Contact</a></li>
     </ul>
     <ul class="socials">
+      <li><a target="_blank" href="https://github.com/toolboxtheplatform/toolbox.app"><img alt="twitter" width="50" src="./assets/github.png"></a></li>
       <li><a target="_blank" href="https://twitter.com/ToolboxTp"><img alt="twitter" width="50" src="./assets/twitter.png"></a></li>
       <li><a target="_blank" href="https://www.facebook.com/pg/Toolboxtp-107283820665269/about/"><img alt="facebook" width="50" src="./assets/facebook.png"></a></li>
       <li><a target="_blank" href="https://www.reddit.com/user/contactustoolbox"><img alt="reddit" width="50" src="./assets/reddit.png"></a></li>