Update `gitignore`

.gitignore

@@ -30,11 +30,12 @@ tests-examples
 *.csv
 
 /editor/*
-!/editor/utils/
 !/editor/readonly-editor.tsx
+/editor/utils/*
 !/editor/utils/roadmap.ts
 !/editor/utils/font.ts
 !/editor/utils/is-mobile.ts
+
 /renderer/*
 !/renderer/index.tsx
 !/renderer/renderer.ts