Fix broken NeMo docs link and remove dead YouTube channel

Restore correct ResearchGate profile link

Security hardening + truthfulness pass (CSP, noopener, honeypot, link…

… fixes, demo/In-Progress honesty, dataset stat, academic line)

Live state before site-polish: false claims removed, metrics aligned …

…to real inventory

Session 3: Chat widget enhancement, new HF projects, skills update, U…

…X polish

fix: add Speaking link to all page navigations 🔗

- Added speaking.html to nav in 8 pages
- Fixed placeholder talk links (now show 'Coming Soon')
- Updated talk dates to 2025/2026
- Consistent navigation across entire site

Stable version before session 2 improvements

First launch of agenticbrahim.dev