feat: add useSite hook

This extra commit is needed, because 506f7b1 was not prefixed with feat.

Author: bartlangelaan

packages/hn-react/src/context/site.tsx

@@ -2,7 +2,6 @@ import { Site } from 'hn';
 import * as React from 'react';
 import globalSite from '../utils/site';
 
-// Create a new context.
 const HnContext = React.createContext(globalSite);
 const { Consumer, Provider } = HnContext;