nginx/application: Extracted acme snippets from global

roles/nginx/application/templates/acme.conf

@@ -0,0 +1,5 @@
+location /.well-known/acme-challenge {
+    root {{ nginx_validation_directory }};
+    access_log on;
+    try_files $uri $uri/ =404;
+}

roles/nginx/application/templates/global.conf

@@ -1,8 +1,4 @@
-location /.well-known/acme-challenge {
-    root {{ nginx_validation_directory }};
-    access_log on;
-    try_files $uri $uri/ =404;
-}
+include {{ nginx_snippets_directory }}/acme;
 
 location = /robots.txt {
     allow all;