[MQTT] Add a topic copy button

The title speaks for itself. To make it even simpler for the user, we could have a small button to copy the MQTT topic.

Similar to what can be seen on GitHub for example

image

aha I feel like I spend my days explaining this one :joy:

There was a copy button in the initial development, but the problem is that the browser’s copy/paste API is only available on sites available on a domain and in HTTPS. So it broke on local instances.

So on the Gladys Plus side, we could re-enable it, but not for local instances.

Oh crap, forget it (memory of a goldfish) I’m closing the topic