Blue - v0.0.56

PortalWrapper: Remove body lock

This update removes the document.body.style.overflow: hidden approach,
which was previously used as an attempt to scroll lock the body
if components like Modals were open.

However, this approach has side effects, such as if Modals were
used within an iframe.

A couple of updates back, we introduced a new component called
<ScrollLock> (thanks @alisdair ! ❤️ ),
which has been built into <Scrollable>, and indirectly, <Modal>, that magically
remedies these issues.

Modal and PortalWrapper components have been updated to remove
any trace of body locking, and the tests have been updated to match.

No changes are required for Blue users!

Addresses: #118