Load scripts at the bottom of <body>

This is a nice performance win
Homepage: use an accordion to display the events

This makes it easy to collapse and expand events
Homepage: link to events page from events section
Events: link title to event page
Use {% display_event %} everywhere

* Converted include to inclusion tag
* Switched homepage to use display_event
* Added optional feature to truncate descriptions so the homepage 
  can truncate the descriptions 40 words