Generate a page

Summary:
Currently, the repository contains an ect template
and per-server parameters JSON files.

The files seem to compatible with the https://ectjs.com demo.

This small build.js is a page generator for a server.

./build.js ysul will read servers/ysul.json to inject
parameters into tempaltes/index.ect.

Test Plan: ./build.js ysul > /var/wwwroot/nasqueron.org/ysul/index.html

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1276