Suggestion: Allow a more basic installation mode not including all of the backend dependencies

[Norgus]

I think this plugin is a great idea, but like many others, I already have a working local distribution of stable diffusion (there are a few good ones, I like automatic1111's version).

I don't want to end up having multiple full dependency stacks and installations of SD just to use it in different apps, and I'm sure I'm not alone in this.

So my basic suggestion is: Please consider a cut-down version of the addon that interfaces with an existing installation rather than setting it all up from scratch.