archwiki: workaround hard-coded wgScriptPath in the new Vector theme[1]

Without this change, search suggestions don't work.

[1] https://phabricator.wikimedia.org/T288686

roles/archwiki/templates/nginx.d.conf.j2

@@ -75,6 +75,11 @@ server {
         rewrite ^ /rest.php;
     }
 
+    # https://phabricator.wikimedia.org/T288686
+    location ^~ /w/rest.php/v1/search/title {
+        return 302 /rest.php/v1/search/title$is_args$args;
+    }
+
     # special case for '/load.php' type URLs to cache css/js in nginx to relieve php-fpm
     location = /load.php {
         access_log   /var/log/nginx/{{ archwiki_domain }}/access.log main;