add web fonts directly to styles for web apps (#1598)

src/Admin/Sass/site.scss

@@ -1,4 +1,6 @@
-$primary: #175DDC;
+@import "webfonts.css";
+
+$primary: #175DDC;
 $primary-accent: #1252A3;
 $success: #00a65a;
 $info: #555555;

src/Admin/Sass/webfonts.css

@@ -0,0 +1,90 @@
+@font-face {
+	font-family: 'Open Sans';
+	font-style: italic;
+	font-weight: 300;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-italic-300.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: italic;
+	font-weight: 400;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-italic-400.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: italic;
+	font-weight: 600;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-italic-600.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: italic;
+	font-weight: 700;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-italic-700.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: italic;
+	font-weight: 800;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-italic-800.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: normal;
+	font-weight: 300;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-normal-300.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: normal;
+	font-weight: 400;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-normal-400.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: normal;
+	font-weight: 600;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-normal-600.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: normal;
+	font-weight: 700;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-normal-700.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+
+@font-face {
+	font-family: 'Open Sans';
+	font-style: normal;
+	font-weight: 800;
+	font-display: auto;
+	src: url(webfonts/Open_Sans-normal-800.woff) format('woff');
+	unicode-range: U+0-10FFFF;
+}
+