Adds two standalone HTML pages matching the-door dark theme:
- testimony.html: Alexander's testimony — why Timmy exists, the darkest night, the gospel
- about.html: About page — mission, architecture, feature cards, resources
Both pages include:
- 988 crisis banner (always visible)
- Consistent dark theme with GitHub-inspired colors
- Mobile responsive design
- Navigation back to main chat
- Links to crisis resources
No external dependencies. Works on 3G.
