[Dokuwiki] Remove old files when updating

See https://www.dokuwiki.org/install:unused_files for more informations

pica-dokuwiki/run.sh

@@ -9,6 +9,10 @@ set -m
 echo "Copy static Dokuwiki files on top of existing pages..."
 cp -afP /var/www/{update/*,html/}
 
+echo "Remove old files..."
+grep -Ev '^($|#)' /var/www/html/data/deleted.files | xargs -n 1 rm -vf
+
+echo "Launching Dokuwiki..."
 php-fpm7.3 &
 nginx &