CTL/purescriptFlake: error: nodejs_14 has been removed as it is EOL

[bladyjoker]

CTL uses older nixpkgs in which nodejs 14 is still not marked as dead.

I believe node2nix is the culprit here, but we should definitely fix CTL to have weekly and reliable nixpkgs upgrade as to not block its dependents.

[bladyjoker]

Hacked this bff37f6
in #158

[bladyjoker]

Handled in mlabs-haskell/flake-lang.nix#34