RFC: add docker container link and app logo to each of the application.md files

[bcurran3]

Is your feature request related to a problem? Please describe.

No, it's about information and beautification.

Describe the solution you'd like

I would like to see a link added to each application documentation page, underneath the project page, that points to the dockerhub container info (or GitHub project page might be better in most cases).

I'd also like to see the app's logo displayed.

Describe alternatives you've considered

Alternative would be not to have, just as now for most of the apps.

Additional context

Sometimes there is a wealth of information about the container (e.g. environment variables) that could be useful to advanced users who want more control over configuration options than the original contributor took into consideration when adding to Ansible-NAS.

I"m willing to take on this task.

Can I hear an "Alleluia!"? Can I hear a "Hell yeah!"? Can I hear a "Git 'er done!"?

[thatRailsGuy]

I'd also like this / be willing to work on it.