Busy/Free Desk Indicator

Bring in the New Year in style... the Holiday Wreath shader has been replaced with a Fireworks shader! See the sparkling explosions from the safety of your desk.

Added a new holiday wreath shader to celebrate the holidays!

Also, I've tested the Busy/Free Desk Indicator with CircuitPython 6, and it doesn't like having the Circuit Playground's filesystem mounted in read-only mode. If you would like to use CircuitPython 6 then omit boot.py when installing the software - otherwise stick with CircuitPython 5.3.

Now you can rotate through different LED animations by pressing the B button while idle! I'm still a fan of the original "rotate" animation tho...