Remove mixins

bulma.sass

@@ -4,4 +4,3 @@
 @import "sass/elements/elements.sass"
 @import "sass/components/components.sass"
 @import "sass/layout/layout.sass"
-@import "sass/utilities/mixins.sass"

docs/bulma-docs.sass

@@ -1,6 +1,7 @@
 @charset "utf-8"
 
 @import "../bulma.sass"
+@import "../sass/utilities/mixins.sass"
 
 // Override