JavaScriptmas Day 6 - Text Christmassifier

My effort for Scrimba's JavaScriptmas 2021 Day 6 challenge.

The task was to:

• Add .christmassified class to #greeting element
• Check whether christmassifierBtn has .christmassified on it. If so, change text to "De-christmassify", if not, change text to "Christmassify"

I also added some Amigatastic Christmas music (From the Fire & Ice Christmas Special, 1992) and a fun backdrop.