Implement --wprocket

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

wo/cli/templates/map-wp.mustache

@@ -1,4 +1,4 @@
-# NGINX CONFIGURATION FOR FASTCGI_CACHE EXCEPTION - WO v3.9.5
+# NGINX CONFIGURATION FOR FASTCGI_CACHE EXCEPTION - WO v3.9.7
 # DO NOT MODIFY, ALL CHANGES WILL BE LOST AFTER AN WordOps (wo) UPDATE
 
 # do not cache xhtml request
@@ -52,6 +52,11 @@ map $is_args $query_no_cache {
     "" 0;
 }
 
+map $https $https_prefix {
+    default "";
+    on "-https"
+}
+
 # if all previous check are passed, $skip_cache = 0
 map $http_request_no_cache$cookie_no_cache$uri_no_cache$query_no_cache $skip_cache {
     default 1;