JS 4: Task 2. Replaces API tutorial with a fetch() tutorial using trivia api

[kyorkston]

Removes the BBC API tutorial as it can no longer be used. It replaces it with a quiz app where the learner can fetch from the api and display some questions but also have user interaction send data to the api. It leaves a lot to be expanded into a great little app, teaches the basics of the fetch() api.

Resolves #461