Provide a build without popper.js

[Kilbourne]

Hi! We are using Popper.js for other things beyond Shepherd. In our case the bundle of Shepherd could be reduce: would be great to have a build of Shepherd, which expects a createPopper function on window object Sth like:

-import { createPopper } from '@popperjs/core';
+const createPopper = { window }

[RobbieTheWagner]

@Kilbourne we could look at making it a peerDependency instead perhaps. I think we used to do that, but found that bundling it was easier.

[Kilbourne]

@rwwagner90 do you know when an unbundled version will be available?

[RobbieTheWagner]

We use FloatingUI now, so this question is no longer valid.