feat(backup): document backup deletion & factor deletion flows

[paolodamico]

Pretty clear title.

[Copilot]

Pull Request Overview

This PR documents two key backup flows in the World App backup system: factor deletion (BF-7) and backup deletion (BF-8). The documentation provides detailed flowcharts and explanations for how the system handles removing backup factors and complete backup deletion scenarios.

• Adds comprehensive documentation for factor deletion and backup deletion flows
• Includes detailed Mermaid flowcharts showing the decision trees and error handling paths
• Updates the documentation navigation to include the new flows page

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
world-app/backup/flows.mdx	New documentation file containing detailed flowcharts and descriptions for factor deletion (BF-7) and backup deletion (BF-8) flows
docs.json	Updates navigation structure to include the new flows page and reformats array syntax for consistency

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