Adding back Geomanist for headings

Author: pastelsky

styles/fonts.scss

@@ -0,0 +1,7 @@
+@font-face {
+  font-family: 'Geomanist';
+  src: url('../assets/geomanist-medium.woff2') format('woff2'),
+  url('../assets/geomanist-medium.woff') format('woff');
+  font-weight: 600;
+  font-style: normal;
+}

styles/index.scss

@@ -6,6 +6,7 @@
  */
 
 @import 'vars';
+@import 'fonts';
 @import 'functions';
 
 @import './reset';

styles/markdown.scss

@@ -16,6 +16,7 @@
   h6 { font-size: getFontSize(-1); }
 
   h1, h2, h3, h4, h5, h6 {
+    font-family: 'Geomanist';
     font-weight:600;
     line-height:1;
     margin:1.5em 0 0.25em;