archwiki: enable Extension:NativeSvgHandler

Adding the extension was discussed here:
https://wiki.archlinux.org/index.php?title=ArchWiki_talk:Maintenance_Team&oldid=788677#Replace_PNG_images_with_SVG



Signed-off-by: Christian Heusel <christian@heusel.eu>

roles/archwiki/templates/LocalSettings.php.j2

@@ -458,6 +458,9 @@ wfLoadExtension( 'VisualEditor' );
 wfLoadExtension( 'Linter' );
 wfLoadExtension( 'DiscussionTools' );
 
+wfLoadExtension( 'NativeSvgHandler' );
+$wgFileExtensions[] = 'svg';
+
 ##
 ## Temporary settings for maintenance
 ##