You can hide the menu by having this custom css (assuming the menu is third in the list) –
#primary-menu > ul.menu > li:nth-child(3) { display: none; }
I notice though with this change, it so happens that none of the menu items are selected initially and the lava lamp menu highlight can disappear when you are at the top of the page. If you are ok with this, the above code should do.
Instead of hiding the menu, how about renaming this page section to something more meaningful than intro – something closer to what is being presented on the page? Something like App Features, Benefits or whatever enhances the meaning of that section, custom to what is being presented on your site. Hope this helps.