GitHub Actions Java 23.0.2 -> 24.0.1

Fix Upset event

Intent was for non-provisional ratings, but check was inverted

Add .upset and .phoenix to colors.css + simple.css

Add cooldown at startup

Choose among all Team Battles today

If there are multiple Team Battles for a team,
show them in a drop-down box so it is possible to choose which to
announce for.

Sort Team Battles by start time

When multiple Team Battles exists,
wrong could be picked.

Simplify and echo GitHub Actions command

Initial commit