Upgrade jQuery, clipboard.js and fontawesome

Upgrade jQuery to v3.3.1, clipboard.js to v2.0.1 and fontawesome to v5.3.1

themes/typing/layout/_partial/head.ejs

@@ -31,6 +31,7 @@
   <%- css('css/typing') %>
   <%- css('css/donate') %>
   <% if (theme.icons){ %>
-  <%- css('css/font-awesome.min.css') %>
+  <%- css('css/fontawesome.min.css') %>
+  <%- css('css/brands.min.css') %>
   <% } %>
 </head>

themes/typing/source/css/brands.min.css

@@ -0,0 +1,5 @@
+/*!
+ * Font Awesome Free 5.3.1 by @fontawesome - https://fontawesome.com
+ * License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)
+ */
+@font-face{font-family:"Font Awesome 5 Brands";font-style:normal;font-weight:normal;src:url(../webfonts/fa-brands-400.eot);src:url(../webfonts/fa-brands-400.eot?#iefix) format("embedded-opentype"),url(../webfonts/fa-brands-400.woff2) format("woff2"),url(../webfonts/fa-brands-400.woff) format("woff"),url(../webfonts/fa-brands-400.ttf) format("truetype"),url(../webfonts/fa-brands-400.svg#fontawesome) format("svg")}.fab{font-family:"Font Awesome 5 Brands"}