[Frontend] Hiding non-functional items; padding adjustments

WTD-1163
WTD-1146
New CSS to hide non-functional elements, including browse.top-bar with search elements;
Adjusted spacing, mainly in .contents CSS class;

platform/commonUI/general/res/sass/_main.scss

@@ -41,3 +41,4 @@
 @import "properties";
 @import "autoflow";
 @import "iframe";
+@import "hide-non-functional";