closes https://github.com/TryGhost/Team/issues/1244
- moved the `<KoenigSettingsPanel>` usage outside of the `<KoenigCard>` contents so it gets positioned relative to the outer card container rather than the inner card container so it's not affected by the inner card changing width/breaking out of the outer container
refs https://github.com/TryGhost/Team/issues/1229
- mostly mirrors image card functionality but rebuilt with more modern syntax
- when uploading a video the size and duration is extracted along with a screen capture of the video from 0.5s in, the screen capture is uploaded once the video finishes because we need to use the uploaded video url as a reference to attach it as a thumbnail via the API
- the captured screenshot is currently what's shown in the card
To be implemented:
- "incomplete" state when video has been uploaded but not a thumbnail
- uploader in settings panel to change the video thumbnail
- play button overlay _or_ switch to `<video>` so it can be previewed
