Option to delete modules and reinstall

[silverwind]

After a dependency update, it's usually best to wipe node_modules and reinstall. I'm considering adding a command line switch to do just that for node_modules and whatever files yarn v2 uses, if present.

[silverwind]

Some notes:

1. check for .yarnrc.yml and yarn.lock. if found, delete yarn.lock, .pnp.js, .yarn/cache and run yarn
2. check for .yarnrc, yarn.lock. if found, delete yarn.lockm node_modules and run yarn.
3. delete node_modules and package-lock.json and run npm i.