Document how Flows run

[lukestanley]

There is a lack of clear, detailed documentation on how Flows are executed within in Kendraio App by Angular components. This gap hinders effective troubleshooting and development. #435

• Mermaid diagrams could map out the basic Flow execution process of some Flow examples.
• Clarifying the process of data and event handling between Blocks.
• Investigating the role of Angular's change detection in the Flow process.
• Special focus on any mechanisms like pub/sub systems and their integration.

A precise and accessible understanding of how Flow's execute will development and problem-solving.