Allow a fedocal user to subscribe to an event to get reminders. This may be easiliy solved by giving the user a shortcut to add the event to the user's favourite calendar service (google calendar, ical). The reminder part will then be taken care of by the user's calendar service.
1. adding iCal output for single meeting (as oppose to whole calendar as we have now)
2. add the reminder logic in the iCal output
3. when offering the possibility to download a meeting, offer the choice to have a reminder for it
Reference for adding reminder in ical: https://richmarr.wordpress.com/2007/12/18/adding-events-to-users-calendars/
Implemented and merged in https://github.com/fedora-infra/fedocal/pull/162
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