US 11 - Database outsourcing

Value proposition

As a developer I want to have a real database In order to store information in it.

Create a database on mongoDB and fetch the data
Acceptance criteria
[x] After the outsourcing, the app should work as before
[x] Data can be fetched from the database
[x] The user can see, if the loading process takes longer
[x] If no data can be fetched, the user get an information, that there is a problem
Tasks
[x] Create a database on mongoDB
[x] Create the collection and assign the keys, like in the db.js file
[x] Install SWR and use it to fetch the data
[x] Write the fetch function, and implement the info and error handling
[x] Get the placeholder image from images, or find a way to store images maybe on a third party cloudservice