Use second- and third-level headings, respectively. When rendered
in GitHub, `#` is an `<h1>`, which should actually be the most pro-
minent heading on the page; in this case GitHub's own headings sho-
uld take precedence, so ours should start at `<h2>` essentially.
Signed-off-by: Alan Orth <alan.orth@gmail.com>
