Host Swagger API docs on api.signalen.org

[felixfaassen]

Currently the API documentation of the backend is hosted on https://api.data.amsterdam.nl/api/swagger/?url=/signals/swagger/openapi.yaml#/

Would be nice to create an api.signalen.org where we host the swagger docs

[felixfaassen]

Solution to generate an open-api repo using OpenAPI spec file could be a nice solution to host it on github pages: https://swagger.io/blog/api-development/generator-openapi-repo/