"Show Documentation" button in "Create Container" view

[fabiante]

I'd love to see a "Show Documentation" button in the "Create Container" view. Often there is the need to quickly look into the Dockerhub info page to look up what ports a container exposes, etc.

A button like this would be very convinient.

[hzlmn]

Seems like good first issue @deviantony can i take a look on this?

[deviantony]

@hzlmn sure feel free to open a PR. Note that this button should only be displayed when the "Dockerhub" registry is selected.

[deviantony]

Following the comment in #2440, a link in the image details view should be added as well.

[jamescarppe]

We have a Search button here now for Docker Hub images, which should get you most of the way there.