Chore: collapse imports from the same library into a single statement

[TatisLois]

I've started to use the platform template for a project and have been loving it as a starting point and as a way to learn about next 13.

I noticed in the components/nav.tsx file the application is importing icons twice from lucide-react. This small PR removes the second import and moves the imported icons to the first import statement.

First time contributing so please let me know if I need to do or should have done anything differently. Thank you!

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