Update Hack Information

[brucellino]

You need to set the folllowing variables :

1. [ ] repo: The github repo where this website is kept
   1. [ ] discuss_topic : Create a topic on the forum for attendees to introduce themselves
   2. [ ] agenda: The link to the agenda page
   3. [ ] registration: link to the registration page
   4. [ ] start_time, end_time : epoch time when the event starts and ends - use e.g. http://www.freeformatter.com/epoch-timestamp-to-date-converter.html