[FEATURE] Add existing export functionality from calendar page

[DereC4]

Recently exporting was added so the libs are there already, and you can do it from settings!

A nice additionally way would be to export your schedule from here (demo)

[Preston-Cook]

How would the UI look for all the different ways to export it (png, cal, unique IDs)?

[DereC4]

How would the UI look for all the different ways to export it (png, cal, unique IDs)?

This is referencing the export current schedule to .json function (you can see it in settings of the current build)