Import custom overrides Sass before variables are used

Author: Chris Montgomery

assets/css/just-the-docs.scss

@@ -16,6 +16,12 @@
 // Support
 @import "./support/support";
 
+//
+// Import custom overrides
+//
+
+@import "./custom/custom";
+
 //
 // Import custom color scheme scss
 //
@@ -36,8 +42,3 @@
 @import "./tables";
 @import "./code";
 @import "./utilities/utilities";
-
-//
-// Import custom overrides
-//
-@import "./custom/custom";