docs(pl): added polish translation to folder-structure-app.mdx and usage/drizzle.mdx

[wiktrek]

✅ Checklist

• I have followed every step in the contributing guide (updated 2022-10-06).
• The PR title follows the convention we established conventional-commit

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Changelog

• Added polish translation to folder-structure-app.mdx and usage/drizzle.mdx.
• Updated polish translation to installation.mdx

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💯

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Name	Status	Preview	Comments	Updated (UTC)
create-t3-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 7, 2025 2:25am

[github-actions]

Hey t3-oss/translators!

This PR contains changes to your language. Please review the changes ❤️.

PL: @matibox, @Infiplaya, @PiotrekPKP

[PiotrekPKP]

Looks good :)