fix path

Author: brownsarahm

files.sh

@@ -1,3 +1,6 @@
-grep "index" _review/*.md > _data/review_list.txt
-grep "index" _prepare/*.md > _data/prepare_list.txt
-grep "index" _practice/*.md > _data/practice_list.txt
+cd _review/
+grep "index" *.md > ../_data/review_list.txt
+cd ../_prepare/
+grep "index" *.md > ../_data/prepare_list.txt
+cd ../_practice/
+grep "index" *.md > ../_data/practice_list.txt