Custom Site for viewing a Gauntlet's levels

[tim-1108]

This PR adds a GD-like menu for viewing the levels in a Gauntlet.

It's accessible when clicking on a Gauntlet in the Gauntlets menu, which previously redirected to the search menu (bc Colon was too lazy to add such a menu). The search menu has not been messed with and it still allows Gauntlets to be shown.

If a Gauntlet is unknown, e.g. a custom one from a private server, it will redirect to the search menu (just like the old days)

[GDColon]

Oh this is cool! Will have to think about it though, since I find the current system to be a lot more convenient