Update PDP documentation with FWSS (Filecoin Warm Storage Service) content

- Updated to focus on FWSS instead of legacy PDP implementation
- Changed from mainnet to Calibration testnet configuration
- Updated Curio to use 'rename' branch instead of 'synapse'
- Added emoji headers for better visual organization
- Simplified wallet setup with delegated address instructions
- Removed detailed pdptool usage section
- Updated Slack channels to include #spx-pdp
- Improved formatting and readability throughout

Author: TippyFlits