*: Dockerfiles cleanup, docker-compose.prod.yaml

New docker-compose.prod.yaml should provide a production-ish deployment
of WorkAdventure

front/nginx-vhost.conf

@@ -0,0 +1,14 @@
+server {
+    listen       8000;
+    listen  [::]:8000;
+    server_name  localhost;
+
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+    }
+
+    location ~ ^/[@_]/ {
+        try_files $uri $uri/ /index.html;
+    }
+}