Ops: Remove npm from dependencies

[tobi-or-not-tobi]

npm is given as a pure dependency in this project (package.json), not sure why. When npm is added as a dependency it will be part of the npm audit process. This process is currently complaining about 5 vulnerability caused by the npm version of fundamental-ui.

If the intend is to ensure consumers of the library are using the correct npm version to build this library, I recommend to add an engine to the package.json, see https://docs.npmjs.com/files/package.json#engines for more info. It would be nice to have support for the latest npm version.