Make `Pagination` component doc page examples be less awful

[jwietelmann]

This looks like a holdover from the way we used to write examples, and I'm not even sure what all this React.createElement(...) class wrapping is about.

[prehnRA]

It's a combination of two things: (1) the playground widget requires you to give code that is one component (thus you can do <Whatever /> or you can do the non-JSX equivalent: React.createElement(Whatever, {...})-- this one just also defines the class inline (2) this example is showing how the pagination would be used (so we wrap the non-stateful thing with a thing that has state, for the sake of making it do something).

[revelry-stalebot[bot]]

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