Create a `export-video-list` script that exports all the video files on
my external hard drive to a JSON file so I can easily see what videos I
have without needing to get and plug in the drive.
I can easily view it using `bat` or `jq` and combine it with `grep` to
search for a specific video - e.g. `cat ~/video.json | grep -i nix`
(`-i` makes the search case-insensitive).