misc: distribute ubuntu font (#23226)

README

@@ -37,6 +37,12 @@ copyright notices:
   # Licensed under the SIL Open Font License, Version 1.1.
   # https://www.fontsquirrel.com/license/yanone-kaffeesatz
 
+* Ubuntu font
+  # https://www.fontsquirrel.com/fonts/ubuntu
+  #
+  # Licensed under the Ubuntu Font License, Version 1.0.
+  # https://www.fontsquirrel.com/license/ubuntu
+
 ~~~~
 
 Some CSS variant files have their own specific licenses.

static/includes/_font-ubuntu.scss

@@ -0,0 +1,21 @@
+$ubuntu-font-path: '../fonts/ubuntu' !default;
+
+@mixin ubuntu-font($type, $weight, $style: normal) {
+	@font-face {
+		font-family: 'Ubuntu';
+		src: url('#{$ubuntu-font-path}/ubuntu-#{$type}-webfont.woff2') format('woff2'),
+		url('#{$ubuntu-font-path}/ubuntu-#{$type}-webfont.woff') format('woff');
+		font-weight: $weight;
+		font-style: $style;
+	}
+}
+
+@mixin ubuntu-font-pair($type, $weight) {
+	@include ubuntu-font($type, $weight);
+	@include ubuntu-font(#{$type}i, $weight, italic);
+}
+
+@include ubuntu-font-pair('l', 300);  // light
+@include ubuntu-font-pair('r', 400);  // regular
+@include ubuntu-font-pair('m', 500);  // medium
+@include ubuntu-font-pair('b', 700);  // bold