minor update for cleaning script

clean.sh

@@ -6,17 +6,7 @@ else
     project_root=$1
 fi
 
-rm -rf *~
-rm -rf auto
-rm -rf _minted*
-rm -rf *.tex
-rm -rf *.aux
-rm -rf *.log
-rm -rf *.toc
-rm -rf *.out
-rm -rf index.pdf
-rm -rf headers.pdf
-rm -rf headers.html
+rm -rf *~ auto _minted* *.tex *.aux *.log *.toc *.out index.pdf headers.pdf headers.html
 for filename in *; do
     if [[ -d $filename ]]; then
         cd $filename