Ideally these shouldn't have spaces around them either, but the
font we're using (at least in my browser) has em-dashes that
hardly merit the name -- about twice the width of an interword space.
So I leave them bulked up with spaces.
This isn't very slick, but it should get the main points down,
and it's past time we got something like this up. Definitely
needs in the future another pass at the text, and also some images
(screenshots, etc.) and styling.