Use Postman for API Documentation

[Nickyshe]

Description

API Reference: I suggest using Postman for Sigstore API documentation instead of Swagger. The reasons are :

• Postman provides a more intuitive interface for documenting APIs.

• It also leverages testing and debugging your API

• It also supports multiple markdown format

• It also enhances collaboration among team

• Postman also offers auto-generated documentation from requests using postbot

• Postman Environment is developer focused

@dmitris @feelepxyz @flavio @phillmv