feat: write typescript on main; restart when changed

1. use main.development.ts instead of main.development.js
2. ignore main.development.js and main.development.js.map

Author: maple-leaf

.gitignore

@@ -41,5 +41,7 @@ app/style.css.map
 dist
 main.js
 main.js.map
+app/main.development.js
+app/main.development.js.map
 
 .idea