Add nginx as a role dependency where required

This is pretty much anywhere a LE certificate is needed. Similar for
nginx-php for PHP sites. Drop these roles from setup.yml.

setup.yml

@@ -41,32 +41,25 @@
 
 - hosts: doc
   roles:
-    - nginx
-    - nginx-php
     - dokuwiki
 
 - hosts: git
   roles:
-    - nginx
     - forgejo
 
 - hosts: kanboard
   roles:
-    - nginx
-    - nginx-php
     - kanboard
 
 - hosts: matrix
   roles:
     - postgres
-    - nginx
     - synapse
   vars:
     user: synapse
 
 - hosts: monitor
   roles:
-    - nginx
     - influxdb
     - grafana
 
@@ -74,28 +67,23 @@
   roles:
     - postgres
     - redis
-    - nginx
     - netbox
   vars:
     user: netbox
 
 - hosts: unifi
   roles:
-    - nginx
     - unifi
 
 - hosts: vrata
   roles:
-    - nginx
     - ocserv
 
 - hosts: web-front
   roles:
-    - nginx
     - reverse-proxy
 
 - hosts: zid
   roles:
     - opensmtpd
-    - nginx
     - friwall