Prior to this change, we've struggled to deploy to external environments
 in case document root folder is not named "www". We need to either create
 a symlink or completely rewrite deploy job to make it work.
Both options required extra efforts from devops team, were error prone
 and symlink option is not reliable by itself: there are chances that
 symlink will be deleted and then deploy will be broken in terms of the
 results but the deployment job will be green, so it is hard to notice
 that something got broken.
Now we can rename DOC_ROOT to any arbitrary value, and this means
 we can deploy www to whatever folder name on the remote server we needed.

It turned out that user and group variables defined in group ci settings
 have higher precedence that dotenv reports. So we need to remove them
 in favour of job variables to make dotenv report work as expected.

needs keyword bypasses stage prerequisites and deploy will happen earlier then test will be finished.
This is a mistake, we shouldn't deploy anything if we define tests and they are red.

Refactored deployment paths

See merge request boilerplate/ci!2

Closes CE-39218

Pagespeed module has been removed from the nginx.