Rename websocket /ws → /dougal-websocket.

The Webpack dev server seems to really like /ws and ignores any
attempts to set a different path, so we just rename our websocket
instead.

lib/www/server/ws/index.js

@@ -15,7 +15,7 @@ function start (server, pingInterval=30000) {
 	server.on('upgrade', (request, socket, head) => {
 // 		console.log("Received upgrade request", request.url);
 		const url = URL.parse(request.url);
-		if (/^\/ws\/?$/.test(url.pathname)) {
+		if (/^\/dougal-websocket\/?$/.test(url.pathname)) {
 			wsServer.handleUpgrade(request, socket, head, socket => {
 				wsServer.emit('connection', socket, request);
 			});