support multi dir

you can now have multiple directories in pages/ and they will all end up
in builds/

mkhtml

@@ -49,8 +49,10 @@ fi
 echo ""
 echo "Building files..."
 
-# https://stackoverflow.com/a/54563899
 cd $PAGESDIR
+find -type d -links 2 -exec mkdir -p "$BUILDSDIR/{}" \;
+
+# https://stackoverflow.com/a/54563899
 find . -type f -print0 | while IFS= read -r -d $'\0' file; do
 	filename=$(echo $file | sed 's/.\///')
 	newloc="$BUILDSDIR/$filename"