Documentation Update: 0.6.16

[sg-doc-holiday]

Building Workflows documentation

• Adds detailed instructions for using synchronous webhook calls with the /sync endpoint in workflows
• Explains timeout behavior with synchronous webhook calls returning a 408 response after 30 seconds
• Documents how to return a response from within a workflow using the HTTP Return Response action
• Enhances the workflow building guide with comprehensive sections on creating workflows, adding triggers and actions, testing individual steps and entire workflows, and publishing workflows
• Includes illustrative images and step-by-step instructions to assist users in navigating the workflow editor and configuring workflow components

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This was opened from: https://github.com/openops-cloud/openops/releases/tag/untagged-1d815eee131919ec3d0d