HPCC-11667 Advanced menu falls behind nav bar

The advanced menu and search bar falls behind the navigation bar.
Utilize @media query to make items visible if under 960px resolution
which is 1024x768 screen resolution or if the browser window is scaled.

Signed-off by: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Tested. Line#238 "float:left" does need to happen since the width:100% on the div makes is spill over to the next line. Will re-push.