Add GitHub Pages documentation site

[Copilot]

Publishes a static documentation site for Gee Bee via GitHub Pages.

docs/index.html

Single-page responsive site covering:

• Feature overview (cards)
• Quick start (clone → configure → run/build)
• Docker run & Compose examples
• Full configuration reference table (config key, env var, default, description)
• Notification integration details for Discord, Slack, and custom webhook (including JSON payload shape)
• Taskfile command reference

.github/workflows/pages.yml

Deploys docs/ to GitHub Pages on push to main (path-filtered to docs/**) and via workflow_dispatch. Uses the standard configure-pages → upload-pages-artifact → deploy-pages action chain.

To activate: set Pages source to GitHub Actions under repo Settings → Pages.

[rorpage]

Rebased onto current main and updated docs/index.html to match the July 3 one-shot/cron-systemd refactor:

• Removed the Docker/Docker Compose section and "Docker Ready" feature card
• Removed fetchInterval (no more polling loop)
• Added an Installation section (pre-built release binaries + build from source)
• Added a Scheduling section (systemd timer / cron, replacing the old Docker instructions)
• Added the stateFilePath/STATE_FILE config field and a note that CONFIG_FILE controls config file lookup
• Added a note that the custom webhook only receives the first aircraft per batch
• Added a Versioning section describing the CalVer release pipeline

.github/workflows/pages.yml was left as-is — still correct. Ready for another look.

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