docs.edx.org: corrects neat-based grid min value and list-styling mixin

edx-docs/assets/sass/_base.scss

@@ -57,5 +57,5 @@ strong {
 
 //  reset: lists
 .list--actions, .list--docs, .list--steps, .list--controls, .list--fields, .list--help, .nav--wizard, .list--tips, .field--group {
-  @extend .ui-no-list;
+  @extend %no-list;
 }

edx-docs/assets/sass/utilities/_variables.scss

@@ -85,7 +85,7 @@ $f-monospace: 'Bitstream Vera Sans Mono', Consolas, Courier, monospace;
 
 // grid (neat-based)
 $max-width: 1280px;
-$min-width: 700px;
+$min-width: 760px;
 $grid-columns: 12;
 $gutter: $baseline;