Change markdown -> markup in less mixins

theme/stylesheets/base/markup.less

@@ -1,4 +1,4 @@
-.markdown-content(@md-color: #000, @md-line-height: 1.7, @md-link-color: #4183c4, @md-code-background: #f7f7f7, @md-code-fontsize: 0.85, @md-blockquote-color: #858585, @md-blockquote-border: #e5e5e5) {
+.markup-content(@md-color: #000, @md-line-height: 1.7, @md-link-color: #4183c4, @md-code-background: #f7f7f7, @md-code-fontsize: 0.85, @md-blockquote-color: #858585, @md-blockquote-border: #e5e5e5) {
     // Rate of growth for headings
     @scale: 0.25;
 

theme/stylesheets/base/mixins.less

@@ -1,4 +1,4 @@
-@import "./markdown.less";
+@import "./markup.less";
 
 .link-inherit {
     color: inherit;

theme/stylesheets/ebook/base.less

@@ -13,7 +13,7 @@ body {
 .page {
     // Section and first titles
     .section {
-        .markdown-content(@text-color, 1.6, @md-link-color: @link-color);
+        .markup-content(@text-color, 1.6, @md-link-color: @link-color);
     }
 
     // Hide the title (only used to build PDF table of content)

theme/stylesheets/website.less

@@ -12,7 +12,7 @@
 @import "website/summary.less";
 @import "website/body.less";
 @import "website/buttons.less";
-@import "website/markdown.less";
+@import "website/markup.less";
 @import "website/navigation.less";
 @import "website/glossary.less";
 

theme/stylesheets/website/markup.less

@@ -3,7 +3,7 @@
 }
 
 .book .book-body .page-wrapper .page-inner section.normal {
-    .markdown-content(@content-color, @content-line-height);
+    .markup-content(@content-color, @content-line-height);
 
     .glossary-term {
         cursor: help;