Rename chapters dir to originals

edit-chapters.go

@@ -63,7 +63,7 @@ var replacers = mapSlice(compile, [][2]string{
 })
 
 func run() error {
-	paths, err := filepath.Glob("chapters/*.markdown")
+	paths, err := filepath.Glob("original/*.markdown")
 	if err != nil {
 		return err
 	}