docs: add NetBird to showcase

[heisbrot]

Description

Adds NetBird to the community showcase. NetBird's desktop app was recently rebuilt from scratch with Wails, so this adds it as a showcase example.

• New showcase page docs/src/content/docs/community/showcase/netbird.md with three screenshots (peers/resources view, profiles, settings), a short description, and links to the announcement blog post and source code.
• Three WebP screenshots added under docs/src/assets/showcase-images/.
• Added NetBird to the list in index.mdx (list reordered alphabetically).

No linked issue — showcase additions don't require one.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Built and served the docs site locally (npm run dev in docs/). Verified both the showcase overview page and the new NetBird page render correctly with all images.

• Windows
• macOS
• Linux

Test Configuration

Docs-only change; wails doctor is not applicable. Tested on macOS with the Astro/Starlight docs dev server.

Checklist:

• (v2 only) I have updated website/src/pages/changelog.mdx with details of this PR (v3 changelog entries are added automatically)
• My code follows the general coding style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Summary by CodeRabbit

• Documentation
  • Added a new NetBird community showcase page covering private networking and centralized access control.
  • Included refreshed screenshots of the Peers, Profiles, and Settings views.
  • Updated the community showcase directory to add NetBird and improve ordering of existing entries.
  • Added outbound links to the NetBird blog post and the desktop client UI repository.

[coderabbitai]

Walkthrough

Adds a NetBird showcase page with three screenshots, registers it in the community showcase listing, and reorders several existing showcase entries.

Changes

NetBird showcase

Layer / File(s)	Summary
NetBird showcase page and assets docs/src/content/docs/community/showcase/netbird.md, docs/src/assets/showcase-images/*	Adds NetBird metadata, descriptive content, outbound links, and three embedded screenshots.
Showcase listing updates docs/src/content/docs/community/showcase/index.mdx	Adds the NetBird entry and reorders the HappyTools, Packsmith, and Peirato’s Piano Keyboard entries.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• wailsapp/wails#5620: Adds a related showcase project page and updates the shared showcase overview.
• wailsapp/wails#5656: Overlaps with the showcase index reordering and Peirato’s Piano Keyboard entry.

Suggested reviewers: leaanthony

Poem

I hopped through docs with images bright,
NetBird now joins the showcase light.
Three screenshots tucked in rows so neat,
New links and entries make it complete.
— A cheerful rabbit 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 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.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding NetBird to the showcase.
Description check	✅ Passed	The description mostly matches the template and includes summary, type, testing, and checklist details.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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