* docs: comprehensive overview guide with all recent integrations
- Add all recent integrations: Gmail, Granola, OpenClaw, Agent Zero, Hermes
- Organize by use case: Quick Start, Agent Frameworks, Platform Integrations, Community Agents, Communication Platforms, Data Import
- Include feature comparison matrix with support levels
- Add clear categorization by setup time and complexity
- Structure follows OpenClaw documentation format with clear sections
* docs: update overview guide to match dev-1372-new format
- Use simpler, cleaner organization with focused sections
- Group by: AI Assistants, Platform Connectors, Agent Frameworks, Migrations
- Match icon and formatting style from dev-1372-new branch
- Include all recent integrations: Gmail, Granola, Hermes, Agent Zero, OpenClaw
* docs: clean up Platform Connectors section description
Remove redundant description text for cleaner presentation
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