/noitu now posts the group play card that /noitupvp used to, and the solo
game against the bot moves to /noitubot. In a private chat /noitu points
the user to a group, or to /noitubot.
/noitutop ranks a group's players across all of its cards by wins, best
game and games played.
A one-time startup migration moves /stats history to the new names in
order: noitu to noitubot first, then noitupvp to noitu.
Production data is migrated and every marker is recorded in the system
collection, so the stock dividend-history, sticker legacy-pack and stats
stock_dividend migrations no longer do anything. Stats keeps its startup
index creation and still hides retired stock_dividend rows.
BREAKING CHANGE: the Go module path is now github.com/tiennm99/tiennm99bot,
the default sticker pack is stickers_by_<bot username>, and the health body,
deploy DM, User-Agents and image names say tiennm99bot.
tiennm99