CPANEL.md: untick 'Share document root' when creating a subdomain (irreversible default on cPanel 138) - #272

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/