Incorrect angular dependency type

[marckassay]

When creating an Nx workspace, the @nrwl/angular package is added to the dependencies key in package.json. And when an application is added using @nxtend/ionic-angular it will unconditionally add it to devDependencies key.

Evidence of 'nrwl/nx' doing this can be seen in this section of code.

So depending on the existing package.json, a developer may have 2 different versions of @nrwl/angular package.