yes you could use anything for the front end - and then link to your store site.
But you can add your content pages to the top menu. it is a two-step process. Make your content page.
Then go to Menu and add it - the last field on the form is Link to page - the drop down will have all your content pages to select from. Once you add it there, it will show on the top nav bar
You can also just post the link to the page you wish (might not be in the content pages) using the third field.