Move src assets files out of dist folder, clean up grunt and related files, separate functions and mixins scss...

assets/styles/base/_headings.scss

@@ -0,0 +1,46 @@
+// ==========================================================================
+// Headings
+// ==========================================================================
+@mixin h {
+	margin-top: 0;
+	line-height: $heading-line-height;
+}
+.o-h {
+	@include h;
+}
+
+h1, .o-h1 {
+	@extend .o-h;
+
+	font-size: rem($heading1);
+}
+
+h2, .o-h2 {
+	@extend .o-h;
+
+	font-size: rem($heading2);
+}
+
+h3, .o-h3 {
+	@extend .o-h;
+
+	font-size: rem($heading3);
+}
+
+h4, .o-h4 {
+	@extend .o-h;
+
+	font-size: rem($heading4);
+}
+
+h5, .o-h5 {
+	@extend .o-h;
+
+	font-size: rem($heading5);
+}
+
+h6, .o-h6 {
+	@extend .o-h;
+
+	font-size: rem($heading6);
+}