chore: 🔥 Remove dev.designsystemet.no app

[mimarz]

Haven't used the devsite on bit since it was created and comments on PRs with preview is good enough

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Latest commit: 8370616

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	63.76%	4591 / 7200
🔵	Statements	63.76%	4591 / 7200
🔵	Functions	86.11%	155 / 180
🔵	Branches	75.96%	588 / 774

File Coverage

No changed files found.

Generated in workflow #302

[Barsnes]

I can remove the line in the preview comment in #2417 :)