fonts: add Muli (#37367)

README

@@ -234,6 +234,14 @@ copyright notices:
   #
   # https://www.fontsquirrel.com/license/quattrocento-sans
 
+* Muli
+  # Copyright (c) 2011 by vernon adams (vern@newtypography.co.uk),
+  # with Reserved Font Name “Muli”.
+  #
+  # This Font Software is licensed under the SIL Open Font License, Version 1.1.
+  #
+  # https://www.fontsquirrel.com/license/muli
+
 ~~~~
 
 Some theme variant files have their own specific licenses; refer to

static/includes/_font-muli.scss

@@ -0,0 +1,22 @@
+$muli-font-path: '/static/fonts/Muli' !default;
+
+@mixin muli-font($type, $weight, $style: normal) {
+	@font-face {
+		font-family: 'Muli';
+		src: url('#{$muli-font-path}/muli-#{$type}-webfont.woff2') format('woff2'),
+		     url('#{$muli-font-path}/muli-#{$type}-webfont.woff') format('woff');
+		font-weight: $weight;
+		font-style: $style;
+	}
+}
+
+@mixin muli-font-pair($type, $weight) {
+	@include muli-font($type, $weight);
+	@include muli-font(#{$type}italic, $weight, italic);
+}
+
+@include muli-font-pair('extralight', 200);
+@include muli-font-pair('light', 300);
+@include muli-font-pair('regular', 400);
+@include muli-font-pair('semibold', 600);
+@include muli-font-pair('bold', 700);