Revert "Manage nginx MIME types"

Summary:
YAGNI as T1563 is closed as won't fix, while nginx package
takes care to update the defaults.

This reverts commit 61ef3516961970b42ad469d2914e7c580ea40855.

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D3511