Improve streaming docs

[divyanshu013]

The docs on streaming are not very clear about how streaming works in ReactiveSearch's context. For example, when would results update and when would streamResults update. Some examples would be helpful in understanding this concept with some recipes on handling CUD in the results components.

As a starting point, explaining a TODO app with CUD should suffice.

[siddharthlatest]

@divyanshu013 Do we have this updated now?