refs https://github.com/TryGhost/Ghost/issues/7132
- apply generic `autofocus` support to anything rendered through `liquid-wormhole`
- overrides `liquid-wormhole`'s default `wormhole` transition, adding a check for a `<input autofocus>` element and calling focus on it once the default transition and liquid-wormhole element swap has completed
- autofocus search input in Unsplash modal
