chore: update slack invite link

[aditya-mitra]

closes #3342

Summary by CodeRabbit

• Chores
  • Updated Slack invitation link in contributor guidelines.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Updated the Slack invitation link in CONTRIBUTING.md from an invalid URL to the correct tolgee Slack URL. This fixes the broken community access point referenced in the contributor guidelines.

Changes

Cohort / File(s)	Summary
Documentation URL Fix CONTRIBUTING.md	Updated Slack invitation link from invalid URL to the new tolgee Slack community URL

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

• Single-file change with no logic or functional impact
• Straightforward URL replacement in documentation

Poem

🐰 A link that broke, now stands restored,
The Slack door opens wide once more,
Community voices, now heard and adored,
Conversations waiting at the shore! 🎉

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check	✅ Passed	The pull request updates the Slack invitation link in CONTRIBUTING.md, addressing issue #3342's requirement to correct the invalid Slack invite link.
Out of Scope Changes check	✅ Passed	The pull request only updates the Slack invitation link in CONTRIBUTING.md, which is directly scoped to issue #3342 with no extraneous changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title 'chore: update slack invite link' directly and clearly summarizes the main change - updating the Slack invitation link in CONTRIBUTING.md.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[JanCizmar]

Awesome! Thanks!