Wrong email setup for github

[elliott-king]

Not sure what the right place to mention this (also posting to the IDE).

The learn.co IDE has a supplied git user.email. That user.email is the learn.co account profile email address.

This means the email will be wrong under two instances:

1. The user has a different email for their github account
2. The user has their email private (and a github autogenerated email)

The IDE environment should instead fetch the appropriate email from the github account.