Inject robots meta tag into source code

webserver/nginx.conf

@@ -184,6 +184,9 @@ server {
 
     location / {
         limit_req zone=taka_ratelimit burst=15 delay=5;
+        sub_filter '</head>' '<meta name="robots" content="index, follow, noimageindex, notranslate, noarchive"></head>';
+        sub_filter_once on;
+
         http2_push_preload on;
 
         proxy_redirect   off;