Refactor project away from html

Main reason is to dynamically specify the dimensions for the
board canvas.

frontend/index.html

@@ -5,7 +5,6 @@
   <title>Chess</title>
 </head>
 <body>
-  <canvas id="chessBoard" width="600" height="600"></canvas>
   <script src="main.js"></script>
 </body>
 </html>