Fix Docker instructions in the main README

[vemonet]

Remove outdated instructions about running using Docker from README.md, and redirect the user to the docker-images/README documentation page

[bourgeoa]

There are 2 ways to use docker :

• with the docker-image using some env parameters
• using the Dockerfile and a config.json with extensive parameters

I personally only use the Dockerfile which can also be used to test NSS modifications.

The documentation should reflect that, and not only the docker-image way.

[angelo-v]

You could mount a config.json to the production image as well. The dockerfile is good for development while the image is production ready.

We should not recommend to use the dockerfile in the readme

[bourgeoa]

I don't think the documentation relates only to production ready server. That's why both approach should be maintained.

[angelo-v]

You are right @bourgeoa the readme currently mixes both and we should reflect that for docker as well, just separate both variants clearly by subsections.

[vemonet]

Thanks for the feedback @angelo-v

@bourgeoa I put back the previous documentation describing the use of the Dockerfile at the root of the repository under the Development usage section

[bourgeoa]

OK for me

[angelo-v]

Nice!