Documentation Update: 0.6.19

[sg-doc-holiday]

Updating OpenOps documentation

• Adds a comprehensive update guide for OpenOps version 0.6.19
• Includes instructions for both automatic update via script and manual update with detailed commands
• Provides cleanup steps for removing old Docker images after successful update
• Clarifies authentication and OpenAPI access patterns in the user management guide
• Documents how to sign in as admin, obtain authentication tokens, and create new user accounts via API calls
• Explains OpenOps serves a Swagger UI at an unauthenticated route for API exploration
• Removes references to unverified skipauth claim to clarify authentication documentation
• Updates local deployment instructions with upgraded version references and detailed OS-specific manual installation steps
• Adds a new workflow documentation page describing the FinOps benchmark process and API wizard flow

This covers 4 commits.

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This was opened from: https://github.com/openops-cloud/openops/releases/tag/untagged-05becd07566e303708b8

The publication for this is: Documentation