Set max_input_vars and upload_max_filesize PHP values

Summary:
We comply with PHP configuration recommandation in the Phabricator manual.

https://secure.phabricator.com/book/phabricator/article/configuring_file_storage/

Fixes T558.

Test Plan:

• php -i | grep max_input_vars
• php -i | grep upload_max_filesize

Reviewers: Kaliiixx, dereckson

Projects: Nasqueron Docker deployment squad

Maniphest Tasks: T558

Differential Revision: http://devcentral.nasqueron.org/D48