feat(ui): add main menu navbar and join game functionality (#35)

Reviewed-on: #35
Reviewed-by: lq64 <lq@blackhole.local>
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

knockoutwhistweb/app/model/sessions/UserSession.scala

@@ -28,4 +28,8 @@ class UserSession(user: User, val host: Boolean) extends PlayerSession {
 
   override def name: String = user.name
   
+  def resetCanInteract(): Unit = {
+    canInteract = None
+  }
+  
 }