add cam's v2 hockey.html and supporting files.

still need to hook into external api
hook the JS into our external api

right now, the calls are mostly stub code, more work needs to be done
to send the right type of data, e.g. UUIDs for players and teams, and
a number of seconds since the start of the game for time
only wrap api response in a {:data x} map if x is not already a map