docs: add deep import recommendation for lucide-react

[youknowom]

Description

📄 This pull request adds a section to the README.md file recommending deep imports for lucide-react.

✅ Example added:

// ✅ Recommended
import VideoIcon from 'lucide-react/icons/video';

// ❌ Not recommended
import { VideoIcon } from 'lucide-react';

[jguddas]

It's quite niche to not have bundler support for this, make it so you explicitly mention which bundlers this is needed for.

[youknowom]

Thanks @jguddas for the feedback! I’ve added the bundler clarification as suggested. Let me know if anything else needs updating

[jguddas]

This is also not what I would recommend, I would recommend you use a bundler / plugin to tree shake your barrel imports.

That's why the text "we recommend" doesn't make me particularly happy, direct imports are a hack that I would prefer people would avoid.