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 learnapollo.

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

[marktani]

Thanks a lot for your feedback, @Aubron.

Learn Apollo has been discontinued in favor of How to GraphQL, could you make a similar feature request here?

That being said, if you feel like contributing an update to LA, I'd be happy to review it.

[Aubron]

Yeah of course. If nothing else I might make a PR with a warning on this section.

New issue:
howtographql/howtographql#570