Remove dark links mixin and sass var

assets/_defaults.scss

@@ -26,7 +26,6 @@ $black: #000 !default;
 
 $color-link: #05b !default;
 $color-visited-link: #8440f1 !default;
-$color-dark-link: $gray-800 !default;
 
 $body-background: white !default;
 $body-font-color: $gray-800 !default;

assets/_main.scss

@@ -116,7 +116,13 @@ ul.pagination {
     @include fixed;
   }
 
-  @include dark-links;
+  a {
+    color: inherit;
+  }
+
+  a.active {
+    color: $color-link;
+  }
 }
 
 .book-section-flat {

assets/_utils.scss

@@ -62,13 +62,3 @@
   overflow-x: hidden;
   overflow-y: auto;
 }
-
-@mixin dark-links {
-  a {
-    color: $color-dark-link;
-  }
-
-  a.active {
-    color: $color-link;
-  }
-}

assets/plugins/_dark.scss

@@ -6,4 +6,3 @@ $body-font-color: #e9ecef;
 
 $color-link: #84b2ff;
 $color-visited-link: #b88dff;
-$color-dark-link: $body-font-color;