Iosevka font (#268)

- Closes #233

components/style/Font.js

@@ -1,5 +1,18 @@
 export default () => (
   <style jsx global>{`
+    @font-face {
+      font-family: 'Iosevka';
+      src: url('//cdn.jsdelivr.net/npm/@typopro/web-iosevka@3.7.5/TypoPRO-iosevka-term-bold.eot');
+      src: url('//cdn.jsdelivr.net/npm/@typopro/web-iosevka@3.7.5/TypoPRO-iosevka-term-bold.eot')
+          format('embedded-opentype'),
+        url('//cdn.jsdelivr.net/npm/@typopro/web-iosevka@3.7.5/TypoPRO-iosevka-term-bold.woff')
+          format('woff'),
+        url('//cdn.jsdelivr.net/npm/@typopro/web-iosevka@3.7.5/TypoPRO-iosevka-term-bold.ttf')
+          format('truetype');
+      font-weight: 400;
+      font-style: normal;
+    }
+
     @font-face {
       font-family: 'Hack';
       src: url('//cdn.jsdelivr.net/font-hack/2.020/fonts/eot/hack-regular-webfont.eot?v=2.020');

lib/constants.js

@@ -5,6 +5,7 @@ export const FONTS = [
   { id: 'Droid Sans Mono', name: 'Droid Sans Mono' },
   { id: 'Fira Code', name: 'Fira Code' },
   { id: 'Hack', name: 'Hack' },
+  { id: 'Iosevka', name: 'Iosevka' },
   { id: 'Inconsolata', name: 'Inconsolata' },
   { id: 'Source Code Pro', name: 'Source Code Pro' },
   { id: 'Ubuntu Mono', name: 'Ubuntu Mono' }