add /config endpoint, add docker proxy setup, and style chat box

docker/Caddyfile

@@ -0,0 +1,10 @@
+localhost:64444 {
+    tls internal
+
+    # Proxy /config path to mumble-web2-proxy
+    reverse_proxy /config http://127.0.0.1:4400
+
+    # Proxy root path to dx-serve
+    reverse_proxy http://127.0.0.1:8080
+
+}