docs: finnish translation

[LukaHietala]

Closes #<817>

✅ Checklist

• [x] I have followed every step in the contributing guide (updated 2022-10-06).
• [x] The PR title follows the convention we established conventional-commit
• [ ] I performed a functional test on my final commit

---

Changelog

deployment

• [ ] docker.md
• [ ] vercel.md

usage

• [ ] env-variables.md
• [x] first-steps.md
• [ ] next-auth.md
• [ ] next-js.md
• [ ] prisma.md
• [ ] tailwind.md
• [ ] trpc.md
• [ ] typescript.md

other

• [ ] faq.md
• [ ] folder-structure.md
• [ ] installation.md
• [x] introduction.md
• [ ] other-specs.md
• [x] t3-collection.md
• [ ] why.md

---

Screenshots

[Screenshots]

💯

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 0528186522fa193264a518600c501a2e1e0183b0

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[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated
create-t3-app	❌ Failed (Inspect)		Nov 28, 2022 at 11:03AM (UTC)

[github-actions[bot]]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	100
🟢 Accessibility	100
🟢 Best practices	100
🟠 SEO	86
🟠 PWA	54

Lighthouse ran on https://create-t3-app-git-fork-lukahietala-next-t3-oss.vercel.app/

[juliusmarminge]

Please check out the new TRANSLATIONS.md and the notes in config.ts and configure the sidebar for your language.

[c-ehrlich]

please add this https://github.com/t3-oss/create-t3-app/pull/970