docs: Add comprehensive experimental documentation plan

- Created detailed plan for adding Experimental section to Strands documentation
- Analyzed existing docs structure, tone, and navigation patterns
- Proposed integration between User Guide and Examples sections
- Detailed content outlines for all config loader functionality:
  - Agent configuration guide with complete examples
  - Tool configuration including MCP integration
  - Swarm configuration for multi-agent collaboration
  - Graph configuration with conditional routing
  - Structured output configuration with schema definitions
- Implementation timeline with 8-week rollout plan
- Success metrics and risk mitigation strategies
- Maintains consistency with existing documentation style and standards

Author: vawsgit