Frontend: Add relevant licence to appear in npmjs

[conorheffron]

Frontend: Add relevant licence to appear in npmjs.

• This should appear here instead of saying none.

The existing licence for the whole code base/repository is here.

One recommended option for this is here.

The package.json should have updates to the following:

{
  "private": true,
  "license": "UNLICENSED"
}

to

"private": false,
  "license": "GPL-3.0-or-later",