Add ‘Archive’ structure

[hiddenillusion]

This will hold data from past conferences

• [ ] Link in top navigation for ‘Past Conferences’
• [ ] update _config.yml
• [ ] either archive entire structure so website at the time of the con is viewable as it as, or only the files modified each year then link it so they are displayed through the current website layout
  • _config.yml
  • /img/(sponsors|partners|cfp|speakers|supporters|venue)
  • /data/(cfp_board|partners|schedule|sessions|speakers|sponsors|supporters)