To do that, you'd just need to log into your site, click on manage site, click on settings, click on content templates, click on login menu template, and then remove all of that coding. That takes away all of the login menus and ect... From there, just make sure you don't use any of the site's features that would be associated with member accounts. This means you yourself won't be able to use them either.
You'd want to construct all of your pages using either html code box elements, or by using html pages. Otherwise, there will be links and ect that will link to the profile system itself, and things won't work out.
Bare in mind that you've just removed the links for yourself to log in and manage your site, so you'll need to note the urls for those pages so that you are able to do so when need be to edit and manage your site.
