Retry on Unauthorized: Add example retries config block

[szmania]

This pull request introduces a retry mechanism for handling unauthorized responses. The changes include:

• Added a new retries configuration block to the main configuration file.
• Updated documentation to explain how to configure retry behavior.
• Included an example configuration snippet for reference.

Example Retries Config

retries:
  max_attempts: 3
  backoff:
    type: exponential
    base: 2
    max: 30

Please review the changes and let me know if any adjustments are needed.