The npoacct campaign was launched before the Supporter program, and
parts of its functionality were incorporated into supporter-page.js
ultimately. This commit hopefully now backports that functionality to
npoacct campaign.
This changes the hard-coded style for what I'm calling the
content-with-donate-sidebar. The advantage of not hard-coding style are
obvious, but I'm doing this now rather than later so that I can add
changes to the CSS that causes the width to extend to 100% on smaller
screen media when the donate bar disappears (the latter of which is
already implemented).
