docs: fix discord link

[bburda]

Pull Request

Summary

Fix discord link

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Type

• Bug fix
• New feature
• Breaking change
• Documentation only

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Testing

How was this tested / how should reviewers verify it?

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Checklist

• Breaking changes are clearly described (and announced in docs / changelog if needed)
• Linting passes (npm run lint)
• Build succeeds (npm run build)
• Docs were updated if behavior or public API changed

[Copilot]

Pull request overview

Updates the project README to correct the Discord invite URL so readers can join the community via a valid link.

Changes:

• Replaced the Discord badge hyperlink with an updated invite URL.