Request: View only mode

**Is your feature request related to a problem? Please describe.**
I want to execute LazyDocker as the default console. The objective is that if a server has only docker running on it, then show in the screen the LazyDocker interface. However, I don't want to leave it with privileges to do any action. The idea is only to work in a View Only mode.

**Describe the solution you'd like**
The idea is to provide a View Only mode, restricted to not execute actions. Then we can attach the process to the console. An enhancement could be to provide a login interface to enable the authentication. And also a shell mode to open a shell.

**Describe alternatives you've considered**
The only alternative that I know is to auto-start at login the process. However, then I can't show any relevant information in the screen when I'm not logged.

**Additional context**
The idea is to run it in the console of the servers used only to run containers. In a similar way that Hypervisors like Xen or ESXi provides as a console interface.