archwiki/templates/nginx.d.conf.j2: fix access to MediaWiki extension assets

Various files in /extensions/ need to be accessible for extensions to work.

Based on example from https://www.mediawiki.org/wiki/Manual:Short_URL/Nginx.

Fixes #355 (closed).

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

@@ -122,8 +122,15 @@ server {
         limit_req zone=archwikilimit burst=10 nodelay;
     }
 
-    # whitelist known OK directories
-    location ~ ^/(?:skins|resources|images|extensions/ArchLinux/modules|extensions/WikiEditor/modules/images/toolbar|extensions/CodeMirror/resources/mode/mediawiki/img)/ {
+    # MediaWiki assets (usually images)
+    location ~ ^/resources/(?:assets|lib|src) {
+        expires 30d;
+        add_header Pragma public;
+        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
+    }
+
+    # Assets, scripts and styles from skins and extensions
+    location ~ ^/(?:skins|extensions)/.+\.(?:css|js|gif|jpg|jpeg|png|svg|wasm)$ {
         expires 30d;
         add_header Pragma public;
         add_header Cache-Control "public, must-revalidate, proxy-revalidate";