Docs: Add wf actions blog

[Assem-Uber]

Summary
Add a blog for controlling workflows from web and add myself as an auther

Screenshots

[Copilot]

Pull Request Overview

Adds a new blog post about workflow control features in Cadence Web and adds the author to the authors registry. The blog post introduces the new "Start Workflow" action that completes Cadence Web's evolution into a unified operational hub for workflow management.

• Adds blog post documenting the new "Start Workflow" feature and other workflow control capabilities
• Registers new author "assem-hafez" in the authors configuration

Reviewed Changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated 1 comment.

File	Description
blog/authors.yml	Adds new author entry for assem-hafez with profile information
blog/2025-10-12-controlling-workflows-from-web/2025-10-12-controlling-workflows-from-web.md	Creates new blog post about workflow control features in Cadence Web

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