HTML Publication Heading Numbers

Adds a second level of heading numbers to headings on html publications. Should now render something like:

    <h1>1. Title</h1>
    <h2>1.1 Title</h2>
    <h3>1.1 Title</h3>
    <h1>2. Title</h1>
    <h1>3. Title</h1>

Also some light styling to go along with it. There was no pivotal ticket for this work.