Improve discoverability of the Settings screens in Noop Desktop

[dupuyarc]

I couldn't find any way to delete a deployment environment, so I asked how in #125.

Even with a screenshot showing me where I could do this, I was initially quite unable to find out how to get to that screen. Only after some random clicking did I discover the menu in the screenshot, and manage to navigate to the settings page where a white X in a solid red circle (rather than a more intuitive trash can) offers the possibility to delete an environment. (Looking at the red-circle-white-X I would expect it to be used to stop (but not delete) an environment, but that is done with the ACTIVE slider, which I was able to discover.)

I would suggest two changes to improve the discoverability of the Settings screens that parallel the Dashboard screens for each level (local/cloud, application, and environment):

1. Put a menu icon of some sort in the breadcrumb boxes (breadboxes?): maybe ≡ or ▾ or something like that, which could give the user the idea that clicking on the box might open up a menu of options.

2. Move the "settings" gear ⚙ icon from its location in the lower right corner of the left box to someplace more noticeable, and higher up on the screen. I only noticed the very subtle gear in a page fold-over (as shown in the annotated screenshot below) when I started looking for a good place to put a "settings" gear icon on the dashboard screens, and realized there already was one there, just subtle and well hidden.

While I'm critiquing the UI, I would also suggest a different icon for the panel pop-out controls in the top-right of each panel. The ≡ icon (despite the clever animation that turns it into an x) would lead most people to think it provides a general menu for the application or environment, which it doesn't, and I found myself annoyed every time I clicked on it (pop-out and dockable panels are nice, but mostly for power users).

Finally, as an inverse to the gear icon that takes you from the dashboard view to the settings view, it would also be nice to have an icon that takes you from the settings view to the dashboard view (you can sometimes use the back ◁ button for this, but not always).

I understand that a lot of these UI elements are probably coming directly from the library you're using (Electron?) and maybe in some developer circles everyone is familiar with how they work, but I really think that if there is any way to change the specific (mis)features I mention above, it would improve the usability for more people.