Create export-video-list script

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).

lib/shared/modules/zsh/abbreviations.zsh

@@ -5,6 +5,9 @@ abbr daily="run create-daily next"
 abbr switch="run nixos nixedo switch"
 abbr sz="source ~/.config/zsh/.zshrc"
 
+abbr evl="export-video-list"
+abbr vv="cat ~/Documents/videos.json"
+
 abbr g="git"
 abbr ga="git add"
 abbr gap="git add -p"