Most sites nowadays have a set of links to different parts of the site on every page. RinkWorks, for instance, has a bar of links to each of the major categories underneath the banner at the top of every page, as well as an extra bar above the banner with links to just the main page and their "Site Guide" page. How they do this is probably using SSI or CGI, which you can bet we're not using here.
Navigation like this, while not strictly necessary, is still nice to have. If you open a page in a new tab, or from an off-site link, the Back button won't help you.
So how are we doing that? Well, while you can totally just make your big, fancy navbar and stick it in a template.html file, you'd have to update every page whenever you want to change it. Something simpler and more likely to stay the up-to-date would be to have a single link to the main page on each page. Where to put it on the page is up to you; I tend to put them at both the top and bottom, but really you only need one.