docs: update layout and styles

Author: mrholek

docs/assets/scss/_component-examples.scss

@@ -382,7 +382,6 @@
   pre {
     padding: .25rem 0 .875rem;
     margin-top: .8125rem;
-    margin-right: 1.875rem;
     margin-bottom: 0;
     overflow: overlay;
     white-space: pre;
@@ -397,6 +396,10 @@
   }
 }
 
+.docs-example-snippet .highlight pre {
+  margin-right: 0;
+}
+
 .highlight-toolbar {
   background-color: var(--cd-pre-bg);
 

docs/assets/scss/_layout.scss

@@ -3,6 +3,10 @@
   @include ltr-rtl("padding-left", var(--cui-sidebar-occupy-start, 0));
   will-change: auto;
   @include transition(padding .15s);
+
+  > .container-lg {
+    --cui-gutter-x: 3rem;
+  }
 }
 
 .docs-layout {