Add baton-http connector documentation

[russellhaering]

Add comprehensive documentation for the baton-http connector, covering:

• Configuration structure with required version field
• All 7 authentication methods (none, basic, bearer, api_key, oauth2_client_credentials, oauth2_password, bearer_dynamic)
• Resource type configuration with CEL expressions
• Pagination strategies (offset, cursor, page, link, none)
• Entitlements, grants, and provisioning
• Kubernetes deployment examples
• Working examples based on actual connector configs

[coderabbitai]

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