Build a new static site

Summary:
Initialize repository with:

• configuration and build scripts from infra-www
• src/ structure from foundation/foundation-zurb-template
• Arcanist configuration: rJOIN @ DevCentral

Ref T1880

Test Plan: arc which + arc lint

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1880

Differential Revision: https://devcentral.nasqueron.org/D3116