Add limiting-factor and docker-registry-api ton index

Summary:
The data/docs.yml is now a collection of key/value.

Keys are the software name, the value the URL.

Ref T1466

Test Plan: Browse homepage

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1466

Differential Revision: https://devcentral.nasqueron.org/D1894