Migrate GitHub Pages from gh-pages branch to Actions workflow

[Copilot]

Replaces manual gh-pages branch maintenance with automated GitHub Actions deployment.

Changes

• Added docs/ directory with demo site (index.html)
• Added .github/workflows/deploy.yml to automatically copy library files from src/ and deploy docs/ on push to main
• Updated .gitignore to exclude generated library files in docs/
• Updated README.md with demo link

The workflow automatically copies callsign.js and callsign.css from src/ to docs/ during deployment, ensuring the demo site always uses the latest library version.

Configuration Required

After merge, configure GitHub Pages:

1. Settings → Pages → Source: "GitHub Actions"
2. Delete gh-pages branch once verified

Demo Preview

Demo shows call sign highlighting with country flags, phonetic information, and automatic detection.

Original prompt

Move website to a GitHub Actions enabled flow instead of a separate branch for GitHub Pages

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[phieri]

@copilot The file docs/callsign.js in now a hardcoded (old) version. It should be automatically deployed.

[Copilot]

@copilot The file docs/callsign.js in now a hardcoded (old) version. It should be automatically deployed.

Fixed in 5985f16. The workflow now copies callsign.js and callsign.css from src/ during deployment, so the demo site always uses the latest version. The library files are excluded from git tracking in the docs directory.