Set up correct API URLs

[simonihmig]

We should add a prompt to query for the correct API URLs, whcih are currently wrong here:

• k5-ember-boilerplate/blueprints/@kaliber5/k5-ember-boilerplate/files/.env-prod-normal

  Line 4 in d2040e7

  EMBER_API_HOST=http://api.<%= dasherizedPackageName %>-production.kaliber5.de

  (and other env files)

• k5-ember-boilerplate/blueprints/@kaliber5/k5-ember-boilerplate/index.js

  Lines 130 to 131 in d2040e7

  	pkg.scripts['dev-prod'] = 'cross-env DOTENV=dev-self ember s --proxy http://api.blutimes-prod.kaliber5.de';
  	pkg.scripts['dev-staging'] = 'cross-env DOTENV=dev-self ember s --proxy http://api.blutimes-staging.kaliber5.d';