Enhance/raw-data-api

[nifedara]

What does this PR do?

Enhances documentation quality

• Adds API description
• Adds 403, 404, and 500 responses to Auth endpoints
• Adds example for 403 response in Auth endpoints
• Adds Error message model
• Removes trailing slashes from Auth endpoints
• Contributes to solving this issue: (Enhance API documentation and examples #219)

Consideration?

• Having responses and examples defined helps consumers handle errors better
• It is also recommended for API security that response schemas be used hence why there is a model for Error message
• Removing the trailing slashes is good practice that ensures consistency in the endpoints

How to test?

Follow Docker Installation Guide
To shoot the server up and view the Documentation change on your localhost