Combine join and chat pages into one url

[siberowl]

Instead of jumping between url's, organize the components onto a single page.

[Njima1572]

Also make it into separate rooms by /:room_id routing

[Njima1572]

server has rooms like

User = {id: string}
Room = {id: string, members: User[] };
rooms = {
   [room_id]: Room
}

Client access room with /:room_id => Room.tsx

const HOST_URL = url
const socket = socketIOClient(HOST_URL)
const App = () => (
    <div>
      <Router>
       <Switch>
        <Route path={'/:room_id`} component={Room} arg={socket} /> // Or whatever it is
        </Switch>
       </Router>
     </div>
)