name change

[MareoRaft]

Consider changing name to "calendar".

Pros:

• iCal, google calendar, BusyCal all use name "calendar"

Cons:

• can't think of any

Either way, both learnnation.org/cal, ./calendar, and ./schedule should all successfully reach the site.

[MareoRaft]

One could argue that 'schedule' is more specific than 'calendar'

[MareoRaft]

name changed successfully finished, although the folder on the server and the tmux sessions are still called 'schedule'