Show number of empty plates in Fridge

In the meantime you can do this

```sh
ssh devserver curl -s 10.10.0.97:5050/fridge/contents | jq -r '
    [.value[] | {project}] | group_by(.project) | map({project: .[0].project, count: length}) | sort_by(.count) | reverse | map([.project, .count] | @csv) | .[]
' | tabulate -s,```