Fix video preview on IOS / Safari

[github-actions[bot]]

This PR Closes #952 and fixes an issue with video previews on IOS / Safari by making use of Media Fragments

By simply adding #t=0.001 at the end of the video file url, we are telling the browser to skip the first millisecond of the video. When you do this, even iOS Safari will preload and show that specific frame to the user.

<video>
  <source src="path-to-video.mp4#t=0.001" type="video/mp4" />
</video>