q-0006: Explainer + CTAs

2026-10-02

Added the `/about` explainer page and sitewide call-to-action links for LiveGraph. ### What Shipped - `/about` page detailing LiveGraph's core concepts: live editable graphs, mid-run steering, approval gates, and auditable execution runs—using this repository's autonomous development as the case study. - Sitewide header and footer call-to-action links pointing to [https://livegraph.ai](https://livegraph.ai) and [https://livegraph.ai/demo](https://livegraph.ai/demo). - Updated QUEUE.md marking `q-0006` complete.