[core-workflow] GitHub migration update for 2016-12-19

[Brett Cannon]

The biggest update is I have updated the code for hg.python.org/lookup.
Once the hg repo is read-only I will generate a final JSON file containing
every commit and then have the new code and data uploaded. If you want to
look at the modified code and double-check my work then please look at
https://gist.github.com/brettcannon/f8d97c92b0df264cd4db008ffd32daf9.

I have also added a TODO to make sure the docs will build from git (kind of
an important thing :) ). I'll reach out to the appropriate people to see
what that will take.
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