feat(ui): add Lobby and Main Menu Body

Added main Menu body and a Lobby with Bootstrap

knockoutwhistweb/app/views/mainmenu/navbar.scala.html

@@ -1,5 +1,4 @@
 @(user: Option[model.users.User])
-@main("Knockout Whist - Main Menu") {
     <nav class="navbar navbar-expand-lg bg-body-tertiary">
         <div class="container-fluid">
             <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navBar" aria-controls="navBar" aria-expanded="false" aria-label="Toggle navigation">
@@ -53,4 +52,3 @@
             </div>
         </div>
     </nav>
-}