Fix outdated Slack URL in README

[philippgille]

With the current link in the README, you're redirected to a page saying that the link is outdated:

Checking the netbirdio/netbird repo, they're using a docs URL which forwards to a working Slack invite: https://github.com/netbirdio/netbird/blob/946ce4c3da24126ae34cc3b482277923863cbddb/README.md?plain=1#L16

This PR updates the Android client repo README to use the same Slack link.

Summary by CodeRabbit

• Documentation
  • Updated Slack community links to direct users to the new documentation portal.

[Copilot]

Pull request overview

Updates the Android client repository’s README to replace an outdated Slack invite URL with the NetBird docs redirect URL that provides a current Slack invite.

Changes:

• Replaced the hard-coded join.slack.com shared invite link with https://docs.netbird.io/slack-url in the header badge link.
• Replaced the same outdated Slack invite link in the “Join our Slack channel” text link.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The README's Slack invitation links are updated across two locations: the top header area and the "Start using NetBird" section. Both links are replaced from join.slack.com with a docs.netbird.io Slack channel link.

Changes

Slack Channel Link Updates

Layer / File(s)	Summary
Slack Channel Links Readme.md	Slack invitation links updated from join.slack.com to docs.netbird.io Slack channel URL in header (line 10) and community section (line 23).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A rabbit hops through links with glee,
From old invites to channels new and free,
The docs now guide to Slack so bright,
Community channels, perfectly right! 📱✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: updating an outdated Slack URL in the README file.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[mlsmaycon]

thanks for the contribution @philippgille