I haven't done anything about the database issues, yet, but this
makes it so database issues don't screw up the UI, and also gives
a slightly nicer error message.
This should make Google search results and Discord link previews
for replays work correctly.
This actually involved a ton of work, but at least this work also
makes replays load faster.
The idea is to eventually move all client parts to their domain name
subdirectory, for clarity and better organization. New Replays is
just first.
Anyway, yeah, minor updates to New Replays, but otherwise it's just
getting deployed as-is, straight to
https://replay.pokemonshowdown.com/
The old URLs are getting taken down; they were only used for
development anyway.
