Update nginx role

- Switch "worker_processes" to "auto"
- Disable "server_tokens" globally
- Change formatting for readability

roles/nginx/handlers/main.yml

@@ -1,6 +1,10 @@
 ---
 - name: restart nginx
-  service: name=nginx state=restarted
+  service:
+    name: nginx
+    state: restarted
 
-- name: reload nginx config
-  service: name=nginx state=reloaded
+- name: reload nginx
+  service:
+    name: nginx
+    state: reloaded