feat(host): Hide manifest wiki link under macOS

[Frederick888]

Changes

c25fe07 feat(host): Hide manifest wiki link under macOS

Since [1] has been silent for quite a while, I don't see Thunderbird's developer docs get updated any time soon. So better to hide the link under macOS to avoid confusion.

[1] https://github.com/thundernest/developer-docs/issues/147

Checklist

• [x] I have rebased my branch so that it has no conflicts
• [ ] I have added tests where appropriate
• [x] Commit messages are compliant with Conventional Commits

Is this a breaking change?

No

Test results

• OS:
• Thunderbird version: