Improve the accessibility of the search option

[rianrietveld]

At the moment the search option at the top of the page, only provides a dropdown with search results.

Now only screen reader feedback is given about the search results in a div at the bottom of the page.

<div id="screen-reader-feedback" role="status">2 results found, tab to read them</div>

Each result is a link, with also the url inside, making the link heavy on content.

But It would be nice to have, next to the dropdown, a submit button that leads to a page with the search results.
With proper links / headings and the page description.