Fix swagger generation and improve docker image

[etienne-napoleone]

Changes:

• Install apidoc and swagger as dev deps, avoid npx
• Change scripts to use apidoc and swagger directly, fix #57
• Use two stage docker image, reducs image size by 3

[etienne-napoleone]

CI will fail at audit step because of https://github.com/lodash/lodash/issues/4837

[etienne-napoleone]

pushed the image manually and deployed to soju, can confirm it works