Document Homebrew install

[humberaquino]

README's Install section now leads with brew install appcues/tap/appcues, pointing at appcues/homebrew-tap, with the cargo build moved under "From source".

The tap formula is bumped by hand from the homebrew-tap repo after each release, so this PR adds no CI job and needs no secret.

Merge after the tap repo is pushed to GitHub, since the install command points at it.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added Homebrew installation and upgrade instructions.
  • Clarified that the Homebrew formula is updated after each release.
  • Moved source-build instructions into a dedicated “From source” subsection.

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📝 Walkthrough

Walkthrough

The README now documents installation with brew install appcues/tap/appcues and upgrades with brew upgrade appcues. It states that the formula is updated after each release. Source-build instructions are now under a From source subsection.

Priority: ⬇️ Low

🚥 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. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.
Title check	✅ Passed	The title clearly and concisely describes the main change: documenting Homebrew installation in the README.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In @.github/workflows/ci.yml:
- Line 131: Add permissions: {} to the homebrew job so it has no inherited
GITHUB_TOKEN scopes, while preserving checkout and push operations through
HOMEBREW_TAP_TOKEN.

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