docs: Update v0.3.0 announcement link

[chtruong814]

What does this PR do ?

Update v0.3.0 announcement link

We no longer are publishing posts to nvidia-nemo.github.io.

Issues

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• Did you write any new necessary tests?
• Did you run the unit tests and functional tests locally? Visit our Testing Guide for how to run tests
• Did you add or update any necessary documentation? Visit our Document Development Guide for how to write, build and test the docs.

Additional Information

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Summary by CodeRabbit

• Documentation
  • Updated the README “News” entry for v0.3.0: replaced the “Blog Post” link with a “v0.3.0 Announcement” that now points to the Discussions page instead of the blog.
  • Improves accuracy and directs readers to the current announcement and community context.
  • No changes to features, behavior, or APIs; this is a documentation-only update.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated README News section: v0.3.0 entry’s link label changed from “v0.3.0 Blog Post” to “v0.3.0 Announcement,” and URL updated from a blog post to a discussions page. No other changes.

Changes

Cohort / File(s)	Summary
Docs: News link update README.md	Changed v0.3.0 News entry label and URL from blog post to discussions announcement.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.
Test Results For Major Changes	✅ Passed	The PR only updates a documentation link in README.md, which is a minor change with no impact on functionality, numerics, or performance. Therefore, the absence of test results in the PR description is acceptable under the custom check criteria.
Title Check	✅ Passed	The title succinctly and accurately summarizes the key change of updating the v0.3.0 announcement link in the documentation, making it clear and specific for anyone reviewing the PR history.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chtruong/update-docs

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