docs(pl): update index.mdx

[SzymCode]

Summary

This pull request adds the Polish translation for src/content/docs/index.mdx.

📋 Related issue: #3149

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Tracked Files

Locale	File	Note
pl	src/content/docs/index.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[dyc3]

Looks like there's some invalid links somewhere: https://app.netlify.com/projects/biomejs/deploys/690db0b2c67cbd0008a1765e

[ematipico]

@SzymCode can you fix the failure?

[SzymCode]

@SzymCode can you fix the failure?

sure, will do it tomorrow

[SzymCode]

@SzymCode can you fix the failure?

I fixed problem, 1 check failed but it's not related with my code