Write "Good Practices" docs for Devs working with Speckle dlls

[AlanRynne]

We've had some issues recently around dependency problems between 2 versions of Core that turned out to be 3rd party plugins using our own libraries and packaging Core alongside with it.

Ideally, we'd create a page in the docs where we explain how to "deploy" your plugins that use Speckle in a way that won't break the default Speckle deployment in the process.