feat(ui): FRO-34 Lobby (#21)

Started with Lobby Component

Co-authored-by: LQ63 <lkhermann@web.de>
Co-authored-by: Janis <janis-e@gmx.de>
Reviewed-on: #21
Reviewed-by: Janis <janis-e@gmx.de>
Co-authored-by: lq64 <lq@blackhole.local>
Co-committed-by: lq64 <lq@blackhole.local>

public/env.template.js

@@ -1,4 +1,5 @@
 window.__RUNTIME_CONFIG__ = {
-  API_URL: "${API_URL}"
+  API_URL: "${API_URL}",
+  WEBSOCKET_API_URL: "${WEBSOCKET_API_URL}"
 };