Iterate on the onboarding for a new instance workflow

[ZJvandeWeg]

Description

Creating a Node-RED instance can be made more approachable. For this story the overview of an application should just have one "Add instance" and "Add device" in those sections.

Epic/Story

#3839

Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

[joepavitt]

Just to double check here, are you saying a single "Add Device" and "Add Instance" button when there are no instances/devices? Or show that button, even when we do have instances already?

[ZJvandeWeg]

Show that button always, even when there's zero of them

[joepavitt]

Adding two more buttons for every Application row, to an already existing, busy page is something I'm a little hesitant about.