Sample backend implementation

Design, do some basic implementation and/or test new or existing backend resolvers for Sauteed Onions.

It can be a backend resolver API behind Onion Services such as:

• Try the Reference monitor implementation.
• A mockup API that just exposes sample API results.
• A simple REST API that wraps around the RSS endpoint from https://crt.sh:
  • Parsing the output of queries such as https://crt.sh/atom?q=www.sauteed-onions.org.
  • Implementing the API definition.

Bonus:

• Docker Compose configuration.
• Host the implementation behind an Onion Service.