EZP-22568: nginx configuration

Link: https://jira.ez.no/browse/EZP-22568

## Description
Configuration files for nginx.

## Tests
Sanity tests on master.

## TODO
* [x] Make API V1 work (index_rest.php)
* [x] Maybe also get rid of the known issue
* [x] Add optional rewrite rules (soap, webdav and performance), follow up: https://jira.ez.no/browse/EZP-22871
* [x] Use same placeholders (ports etc…) as apache so they can be replaced by scripts on testing VM
* [x] ezfind autocomplete doesnt work (ezjscore ?)
* [x] Rebase commits