Portfolio Spacing & Layout

Portfolio adjustments:
-Cleaned up container margins/padding
-Added max-width to header and Settings section
-Refined Portfolio header and nav links

Other adjustments:
-Reduced font size of side nav links

styles/components/_global_layout.scss

@@ -22,14 +22,13 @@ body {
   padding-bottom: $footer-height * 2.5;
 
   .global-panel-container {
-    margin: $gap;
     flex-grow: 1;
     -ms-flex-negative: 1;
     top: $usa-banner-height + $topbar-height;
     position: relative;
+    padding: 0 $spacing-large;
 
     @include media($medium-screen) {
-      margin: $gap * 2;
       top: $usa-banner-height + $topbar-height;
     }
   }