Add features to CLI ref template

[mdlinville]

• Differentiate CLI experimental from daemon experimental
• When the whole command is experimental, point to docs for
  how to get it to show up
• Make badges links where possible
• Add tooltips to badges for more context
• Document in the test.md how to make badges into links and how to use tooltips (shows up at /test/)

Fixes #5718 (except that the CLI ref needs to be rewritten, but that is out of scope for this PR).

You can test some of this on Netlify but if you want to verify that the badge links actually work, you need to build locally with docker build so you get the upstream resources pulled in.

Turning the badges into links is a bit of an Easter egg. They do have tooltips but the point is that they are informative even if people don't realize they can click them. As such, when you do click them it opens the target in a new window / tab.

cc/ @thaJeztah who asked for some of these specifically.

[thaJeztah]

❤️ gonna give this a spin tomorrow

[thaJeztah]

LGTM 👍

[pospanet]

Hi. Is there a way how to enable CLI experimental features on docker for windows, please? I am using latest edge version. Thanks

[gbarr01]

Hi, @pospanet , does this help? https://docs.docker.com/docker-for-windows/#daemon

[pospanet]

Hi @gbarr01. Not really. :-( This enable only daemon (server) experimental features, not CLI's

[mdlinville]

If you look at a reference doc like https://docs.docker.com/edge/engine/reference/commandline/stack_deploy/#options

Notice on flags like --namespace how there is an orange button that says "experimental (CLI)"? You can click that button to get to the doc you need: https://docs.docker.com/engine/reference/commandline/cli/#configuration-files

[pospanet]

Hi @MistyHacks. Thanks for pointing out. Yet, I have been there with no success. Maybe I am fatally overlooking something, but I did not find any property related to experimental features there.

Which property I have to create/modify in a config.json file, please? Thanks

[gbarr01]

@pospanet , add "experimental": "enabled" to your file, .docker/config.json. Don't forget to add a comma to the entry above it, like this:

{
  "HttpHeaders": {
    "User-Agent": "Docker-Client/18.04.0-ce (linux)"
  },

  "experimental": "enabled"
}

[pospanet]

@gbarr01 It works !!! :-) Thanks