minor doc tweak for mobile

build/assets/less/site.less

@@ -12,8 +12,8 @@
 }
 
 .navbar .nav > li > a { padding: 12px 10px 9px; }
-
 .navbar .nav.pull-right { margin-right: -10px; }
+.navbar, .jumbotron, #social-buttons { min-width: 990px; } // necessary fix for non-responsive layouts
 
 h1, h2, h3, h4, h5, h6 { font-family: @serifFontFamily; }