https://marketplace.visualstudio.com/items?itemName=3248.cleanup-after-react
Instantly delete unnecessary boiler plate contents.
Clean App.js, App.css and delete logo.svg
Windows - Ctrl + alt + a
Mac - Cmd + alt/options + a
Clean App.js, App.css and delete logo.svg and import Bootstrap
Windows - Ctrl + alt + b
Mac - Cmd + alt/options + b
Make sure that you are in the folder created by create-react-app and not outside it.
Happy Coding!