refs https://github.com/TryGhost/Ghost/issues/14101
- swapped use of `<LiquidWormhole>` to `{{#in-element}}` because we weren't animating anything
- we can now use `{{css-transition}}` instead if we want to animate in the future
- swapped use of `ShortcutsMixin` for ember-keyboard's `{{on-key}}` modifier
- added `{{query-selector}}` helper so we can grab an element from inside the template rather than requiring a backing component function (used to pass the wormhole element to `{{#in-element}}`)
- added `{{on-resize}}` modifier so the `resizeDetector` service can be used directly from the template rather than requiring a backing component to wait for render and use query selectors to grab an element
