Nginx: Refactor the configuration

[ragnarkurmwunder]

Here are refactored configurations from Trimble. Wunder configuration can be remodeled according to this.

The fastcgi.conf is sorted alphabetically to weed out duplicates, added HTTP_PROXY, etc.

The drupal.conf is completely refactored according to the precedence of the location blocks, otherwise it is tough to understand which rules apply when. This file cannot be used verbatim, but Wunder configuration can follow the suite. In some places, some blocks are missing which are not needed in the Trimble context. In some places, useless fastcgi_params are removed. Etc.

drupal.conf.txt
fastcgi.conf.txt
nginx.conf.txt