docs: add announcement bar about the v5 pre-release

[andrii-bodnar]

Description

Add a v5 pre-release announcement bar

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Examples update

Checklist

• I have read the CONTRIBUTING and CODE_OF_CONDUCT docs
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)

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Name	Status	Preview	Comments	Updated (UTC)
js-lingui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 9, 2024 7:26am

[github-actions]

size-limit report 📦

Path	Size
./packages/core/dist/index.mjs	2.88 KB (0%)
./packages/detect-locale/dist/index.mjs	723 B (0%)
./packages/react/dist/index.mjs	1.68 KB (0%)
./packages/remote-loader/dist/index.mjs	7.26 KB (0%)