Serve assets content for wolfplex.org and dereckson.be

Summary:
https://assets.wolfplex.org and https://assets.dereckson.be serve
static content for web sites and application. For example, they
contain assets used in the 502 pages for the Docker PaaS.

Ref T114
Ref T473

Test Plan: Deployed on Ysul

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T473, T114

Differential Revision: https://devcentral.nasqueron.org/D1963