css: avoid redundant CSS rules

The 'layout.scss' file is meant to be included only from the top-level
`application.scss` file; It does not contain fancy reusable things like
variables or mixins.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

assets/sass/book.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 .ebooks img {
   padding: 5px;

assets/sass/downloads.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 #logo-license {
   @extend .callout;

assets/sass/forms.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 \::-webkit-input-placeholder {
   color: #9a9994 !important;

assets/sass/front-page.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 #front-content {
   @include clearfix;

assets/sass/lists.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 .content-list {
   @extend .unstyled !optional;

assets/sass/man-pages.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 #documentation #main {
   p {

assets/sass/reference.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 .topics h3, .topics ul li {
   padding-left: 23px;

assets/sass/search.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 #search-results {
   position: absolute;

assets/sass/sidebar.scss

@@ -1,6 +1,5 @@
 @import "variables";
 @import "mixins";
-@import "layout";
 
 hr.sidebar {
   width: 218px;