Update preparations 2024-03

[johannesvedder]

• [x] Temporarily disable free text for next update
• [x] Requires versioning before being merged
• [x] Test migration process with main branch
• [x] Style fixes
• [x] Offline mode fix https://github.com/hpi-studyu/studyu/pull/593

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ REPOSITORY	git_diff	yes		no	0.06s

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[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 5916491):

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• https://studyu-dev-designer--pr592-fix-24-03-update-pre-lu688jk7.web.app

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