Frontend Room Persistence

[ebettenga]

right now when you refresh the page, you lose the game you're in.

we want to store some information in sessionStorage so we can navigate you back to the state you belong when you come back to the page.

further, We want to make sure we remove the data when we finish a game, so when we reload it doesn't take us back to the game anymore.

when the page loads, if there's session information stored, we need to call join_room to retrieve the game data and add the new socket back to the room on the backend.