I don't believe the "About Us" or "Contact" info can be removed from the Store page, i.e. whatever is in the chosen template is static. I do see some variation between templates with mine being one of the simplier available. You might try others to see if any are a better fit. I would suggest you make the recommendation for a "simple seller template" that's absent that type of info. Auctiva might see that as a reasonable suggestion for new Store template.
You can change the Header and add a Logo on all the templates, as I've done on mine.
Danno