Implement --wprocket

* cleanup templates by using variables
* add configuration for wp-rocket
* update mapping for wp-rocket

wo/cli/templates/wpfc.mustache

@@ -1,4 +1,4 @@
-# WPFC NGINX CONFIGURATION - WO v3.9.5
+# WPFC NGINX CONFIGURATION - WO v3.9.7
 # DO NOT MODIFY, ALL CHANGES WILL BE LOST AFTER AN WordOps (wo) UPDATE
 # $skip_cache variable set in /etc/nginx/conf.d/map-wp.conf
 
@@ -10,7 +10,7 @@ location / {
 location ~ \.php$ {
   try_files $uri =404;
   include fastcgi_params;
-  fastcgi_pass php72;
+  fastcgi_pass {{upstream}};
   fastcgi_cache_bypass $skip_cache;
   fastcgi_no_cache $skip_cache;
   fastcgi_cache WORDPRESS;