Maintenance: drop unused tap, fix Homebrew install URL, README drift - #13

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Skipping rustup: most recent version 1.29.0_2 not installed

Skipping pipx: most recent version 1.16.2 not installed

Skipping libnghttp3: most recent version 1.18.0 not installed

Skipping geckodriver: most recent version 0.37.1 not installed

Skipping certifi: most recent version 2026.7.22 not installed