feat(docs): update documentation and disable Ask AI feature

Major documentation updates including:
- Add comprehensive code examples page
- Add video tutorial to homepage
- Update Docker deployment instructions for v0.6.0
- Temporarily disable Ask AI feature
- Add table border styling
- Update site version to v0.6.x

BREAKING CHANGE: Ask AI feature temporarily disabled pending launch

mkdocs.yml

@@ -1,4 +1,4 @@
-site_name: Crawl4AI Documentation (v0.5.x)
+site_name: Crawl4AI Documentation (v0.6.x)
 site_description:  🚀🤖 Crawl4AI, Open-source LLM-Friendly Web Crawler & Scraper
 site_url: https://docs.crawl4ai.com
 repo_url: https://github.com/unclecode/crawl4ai
@@ -9,6 +9,7 @@ nav:
   - Home: 'index.md'
   - "Ask AI": "core/ask-ai.md"
   - "Quick Start": "core/quickstart.md"
+  - "Code Examples": "core/examples.md"
   - Setup & Installation:
     - "Installation": "core/installation.md"
     - "Docker Deployment": "core/docker-deployment.md"