docs: update github link in readme

[jithin23-kv]

Problem

The discord invite link in READNE.md got expired

Solution

Update with a new link without expiry

Changes

• README.md

Summary by CodeRabbit

• Documentation
  • Updated the Discord invite link in the README in two places, including the badge and navigation link.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 027abfc7-518c-469a-b6cc-c713dc48f3cf

📥 Commits

Reviewing files that changed from the base of the PR and between 51d3817 and fb257bd.

📒 Files selected for processing (1)

• README.md

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Walkthrough

Updated the Discord invite URL in README.md at two locations: the Discord badge link and the Discord navigation link.

Changes

README Discord link update

Layer / File(s)	Summary
Update Discord links README.md	Replaced the Discord badge hyperlink and the "Discord" navigation link with a new Discord invite URL.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title mentions a GitHub link, but the PR actually updates Discord invite links in README.md.	Rename it to describe the Discord invite link update in README.md.
Description check	⚠️ Warning	The description only includes Problem, Solution, and Changes; the template's Issue and How to test sections are missing.	Add the missing Issue and How to test sections, and include Screenshots if applicable.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/update-readme-github-link

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