Serve sites map directly from https://api.nasqueron.org
Summary:
Don't proxy anymore sites.json, as D1303 introduced CORS support.
This is a follow-up for cd026d254f2fe.
Test Plan:
Browse main page, use "g t" to go to Nasqueron Tools,
ensure there isn't any CORS-related error in console.
Reviewers: dereckson
Reviewed By: dereckson
Differential Revision: https://devcentral.nasqueron.org/D1304