Solve issues & model data

[omiras]

• We are aware of some issues we want to solve
  • updateDocument can't be dependant of the type of the collection to update
  • the view of AdminAnimals the images does not show anymore
• Decide the getData strategy (real-time database or at the beggining of the app)

[omiras]

AddNewAnimal:

• Maybe we should directly assign a value for select options instead of having to "Accept" each option

[omiras]

firebaseconfig.js

getData function should not return always a "pictures" property.