docs: extensive documentation with 12 sections covering every feature

- Overview, Installation, Quick Start, Configuration
- Providers (4 providers with setup instructions)
- Tools (10 built-in tools with parameters)
- Commands (60+ commands organized by category)
- Permissions (3 approval modes, per-tool config)
- Agents (139 agents across 8 categories)
- Auto-Dispatch, Orchestration, NEXUS Pipeline
- Plugins, Hooks, MCP Servers, Memory
- Telemetry, Rate Limiting, Security, Benchmarks
- All pages link to localcode.thealxlabs.ca

Author: thegreatalxx