Serve tools51. through php-fpm on devserver

Summary:
nginx configuration exists on Ysul, but wasn't committed.

Ref T1897

Test Plan: Browse https://tools51.nasqueron.org/

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1897

Differential Revision: https://devcentral.nasqueron.org/D3173