Don't use h5 tags for site title in footer.

[rc-davis]

Google Lighthouse complains about the use of <h5> tags for site titles in page footers. This was highlighted for the NCCS site.

(Lighthouse also complained about the use of an <h3> tag on this page, because there was no <h2> tag, but this happened because the agency started their first heading with ### instead of # or ##, and there's not much we can do about that.)

To observe the problem, go to Settings in the Isomer CMS and set a site's Title. The footer will render the title with an <h5> tags. This can be observed on this test site.

This could be fixed in a variety of ways, such as using a <p> tag with a special class (which is what we do for similar labels in the footer).