refactor(components): rewrite PostsList component

* remove NoResults component and move logic to Search page
* add a usePostsList hook
* remove Pagination from PostsList (it is only used if javascript is
disabled and not on every posts list)
* replace `byYear` prop with `sortByYear`
* replace `loadMore` prop with `onLoadMore`
* remove `showLoadMoreBtn` (we can use `loadMore` prop instead to
determine if we need to display the button)
* replace `titleLevel` prop with `headingLvl`
* add `firstNewResult` prop to handle focus on the new results when
loading more article (we should not focus a useless span but the item
directly)

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