Add CNAME file

Adds the CNAME file that Github requires to be able to use a custom domain with
a Github Pages website.
Add Opportunity data

I added a new data store for opportunities, and a new page that displays them.
I left the page intentionally unstyles and unformatted, because I'm not sure
what's going on in other branches to add a layout system and stuff.  It'll be
easy to add that stuff after the fact.
Merge branch 'master' of github.com:Pitt-CSC/pitt-csc.github.io