Fix thumbnails not working for larger SVGs

See linked docs in code comments

site-cookbooks/kosmos-mediawiki/recipes/default.rb

@@ -170,6 +170,10 @@ $wgGroupPermissions['team']['editprotected'] = true;
 $wgGroupPermissions['sysop']['edit'] = true;
 $wgEnableUploads = true;
 $wgFileExtensions = [ 'png', 'gif', 'jpg', 'jpeg', 'webp', 'svg' ];
+// Parse large SVGs, so they can be thumbnailed without errors
+// https://phabricator.wikimedia.org/T199737
+// https://www.mediawiki.org/wiki/Manual:$wgSVGMetadataCutoff
+$wgSVGMetadataCutoff = 20000000; // 20 MB
 
 $wgExtraNamespaces[100] = "Feature";
 $wgNamespacesWithSubpages[100] = true;