Replace server article services specific data generators with fake-data-generator

[sgobotta]

In the utils server we are using too many custom functions for the articles fake data. We could replace that using the fake-data-generator as a dev-dependency.

Current models: please respect the current type of each property

article: {
  id: Number, // eg: faker random number
  title: String, // eg: faker random words
  content: String, // eg: faker lorem text
  views: Number, // eg: randomNumberBetween or random
}

Checkpoints:

• Run the e2e tests, they should pass.
• Run the unit tests, they should pass.
• Articles service: Replace ipsum dependency with fake-data-generator. Replace the magazines array with a new fake-data-generator model of 40 items
• Remove bavaria-ipsum dependency from the pcakge.json in utils/server-test/
• Rerun e2e tests, they must pass.
• Rerun unit tests, they must pass.