Create a new repo for "integration" demos which consume our extensions

[wise-king-sullyman]

Currently any demos which need to import components from our extensions need to either live in the extension themselves (where they likely wouldn't make sense if they aren't actually part of the extension) or live in this repo under the documentation-site package.

Placing demos directly in org has exposed several significant issues due to the nature of how the docs framework operates, and also isn't the cleanest approach because it it requires introducing typescript compilation and other new dependencies into org.

To resolve these issues we should create a new repo for extension consuming demos to live in, and extract the compass demos and the animation demo into that repo.