* Refactored drag n drop functionality to a hook and component.
* Add the snackbar to the article editor.
* Now you can drag and drop images in the post body content.
* Cleaning up a few things.
* Now post cover images can be dragged and dropped.
* Removed unused empty function.
* Added @testing-library/preact-hooks so that we can test hooks.
* Some renaming, small refactor.
* Added tests
* Added more tests.
* Added more tests.
* Added message about dropping only one image in post body.
* Added message about dropping only one image for cover image.
* put onDrop into it's own meethod.
* More tests.
* Added some API documentation.
* Updated editor help with drag and drop image help.
* Changed wording.
* Now the alt text for markdown removes the file extension.
* Updated help wording. Thanks @rhymes
* Now the image markdown adds a new line at the end as we currently do not support inline images.
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