Supplemental link updates after move to Mozilla Github organization

This change makes a couple of additional updates, post treeherder-node move to Mozilla this morning. The changes are supplemental to those done already by Ed in https://github.com/mozilla/treeherder-node/commit/c7ffe69a6593353a17bebab9a2d93aafae4d4732.

I am assuming the `secret_access_key` doesn't have to change here.

nb. we have decided also to leave James as the repo Author in the package.json file:
`./package.json:  "author": "James Lal [:lightsofapollo]"`

Adding @lightsofapollo for review.