register Submissions.Result highlighter with core

If betterlink.remove() was called, the anchor element that enclosed the
submission would remain on the page. By registering the removal
function, we appropriately clean up the DOM.
load Betterlink immediately on example page

The only reason we had an explicit 'initialize' button was because the
user interface wouldn't initialize during the function call. This seems
to be a timing issue. If we wait 200 milliseconds, the operation
completes as expected.