Update Apollo Examples to use 2.1 Best Practices.

[Aubron]

2.1 emphasizes the use of their new Component based methodology, with things like the <Query> and <Mutation> component. They've pushed for it to the point that it is quickly becoming difficult to find documentation for the 2.0 methods used in howtographql.

A full update to 2.1 for apollo sections seems to be in order.

In a week or two I might be able to take this on, if someone else doesn't beat me to it.

[aboglioli]

Tell me if you need help. This repo contains the tutorial code using new Components.

[itscarlosrufo]

Thanks @Aubron for opening this issue 😄Closing this due to inactivity!