Resolve "Ordering of events on events page should be done by event start date"

What has been done so far:

Order events and group them by past and upcoming

• Order events according to event start date.
• Group events by past and upcoming events.
  • Sort upcoming events from nearest to farest in the future.
  • Sort past events from nearest to farest in the past.
• Provide fallbacks for past and upcoming events if there are none.

What still needs to be done:

• Layouting and designing upcoming and past event lists.

Closes #83 (closed)