Support "repeat skips" days on calendar #234
Description
The Core API now can return a property repeatExcludes per event, which is an array of dates in format YYYY-MM-DD that we should skip when showing repeating events. We need to support this in the calendar UI.
A sample use case is when Happy Hour is cancelled for a specific week - that date will be added to the repeatExcludes array and thus we should not return/render an event on that day. The same behavior should happen on the front page, etc.
See https://core.acm.illinois.edu/api/v1/events for the data format, and https://core.acm.illinois.edu/api/v1/events/f3cb57a9-8e2a-481e-a222-7ba165249ac7 for an example of the repeatExcludes property.
Additional info can also be found here: https://core.acm.illinois.edu/docs#tag/events/get/api/v1/events