Proxy request for wurf -U

Summary:
Serve a proxy for wurg on /upload path.

The current proxy configuration limits requests to 10M.
Instead, switch to a configuration without that limit to allow to override it.

Test Plan:

• wurf -U
• Browse https://windriver.nasqueron.org/upload

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D3620