Fix SCSS compile error by moving breakpoint init (#291)

Author: DiogoRibeiro7

_sass/minimal-mistakes.scss

@@ -9,7 +9,6 @@
 
 /* Mixins and functions */
 @forward "minimal-mistakes/vendor/breakpoint/breakpoint";
-@include breakpoint-set("to ems", true);
 @forward "minimal-mistakes/vendor/magnific-popup/magnific-popup";
 @forward "minimal-mistakes/vendor/susy/susy";
 @forward "minimal-mistakes/mixins";
@@ -38,3 +37,6 @@
 @forward "minimal-mistakes/archive";
 @forward "minimal-mistakes/sidebar";
 @forward "minimal-mistakes/print";
+
+// Configure Breakpoint after loading all modules
+@include breakpoint-set("to ems", true);