Add fork me on GH link

lib/crawly_ui_web/templates/layout/root.html.eex

@@ -142,6 +142,7 @@
             </footer>
         </div>
     </div>
+    <style>#forkongithub a{background:#000;color:#fff;text-decoration:none;font-family:arial,sans-serif;text-align:center;font-weight:bold;padding:5px 40px;font-size:1rem;line-height:2rem;position:relative;transition:0.5s;}#forkongithub a:hover{background:#c11;color:#fff;}#forkongithub a::before,#forkongithub a::after{content:"";width:100%;display:block;position:absolute;top:1px;left:0;height:1px;background:#fff;}#forkongithub a::after{bottom:1px;top:auto;}@media screen and (min-width:800px){#forkongithub{position:fixed;display:block;top:0;right:0;width:200px;overflow:hidden;height:200px;z-index:9999;}#forkongithub a{width:200px;position:absolute;top:60px;right:-60px;transform:rotate(45deg);-webkit-transform:rotate(45deg);-ms-transform:rotate(45deg);-moz-transform:rotate(45deg);-o-transform:rotate(45deg);box-shadow:4px 4px 10px rgba(0,0,0,0.8);}}</style><span id="forkongithub"><a href="https://github.com/oltarasenko/crawly_ui">Fork me on GitHub</a></span>
 </body>
 <script type="text/javascript" src="<%= Routes.static_path(@conn, "/js/app.js") %>"></script>