Move the form element down the page.

This is really just to generate the nonce, and pass the post id into
the field. I don’t know if we really need to wrap it in a form, but who
cares at this point.
Dropping some stray code, sending back the post ID, just so we know that it was sent.
Turned the click action into a function. Makes more sense to me to add it to the success function.