docs: restructure and improve documentation site

[ppradnesh]

Summary

Major documentation restructuring for the Altimate Code docs site:

• New nav structure: Getting Started (Overview + Quickstart) → Examples (Showcase + Guides) → Configure (unified section with Agents, Tools, Skills, Commands, Providers, Governance, Appearance, Integrations) → Interfaces (TUI, CLI, IDE, GitHub, GitLab) → Reference (What's New, Security FAQ, Network, Troubleshooting, Telemetry)
• Merged Components + Configure into a single "Configure" section with a new overview page featuring architecture diagram and grid cards
• Rewrote index.md with GTM messaging, hero section, feature cards, tool showcase, benchmarks, and quick demo prompts
• Added LLM provider config to Quickstart page with /connect command and sample Anthropic config
• Deduplicated content: removed duplicate example cards, trimmed warehouse/LLM config examples in Quickstart, consolidated permission docs with cross-references
• Standardized terminology: "altimate" → "Altimate Code" in prose, consistent 55+ tool count across all pages, page titles matching nav labels
• Added new pages: Configure overview (configure/index.md), What's New changelog (changelog.md)
• Moved sections: Telemetry → Reference, Guides → Examples, Behavior → Governance
• CSS improvements: site title highlight, install command no-wrap fix

Test plan

• Run mkdocs serve and verify all pages render without errors
• Check all internal links resolve correctly (no broken cross-references)
• Verify nav structure matches expected hierarchy
• Confirm "Altimate Code" appears correctly in header and browser tab
• Review index.md landing page layout and formatting

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