ci: Add CI/CD pipelines for build checks and website deployment

[jatinkrmalik]

Summary

Adds two GitHub Actions workflows to establish CI/CD for the project.

Build & Test (ci.yml)

• Triggers on pull requests to main
• Runs on macOS 15
• Builds with swift build and runs tests with swift test
• Ensures every PR has a green build before merge

Deploy Website (deploy-website.yml)

• Triggers on GitHub releases (published) and manual dispatch
• Deploys the web/ folder to GitHub Pages
• Custom domain: vocamac.com (via CNAME file)
• Uses official GitHub Pages actions for deployment
• Concurrency protection to prevent overlapping deploys

Also includes

• web/CNAME file for custom domain configuration