Add Google font imports (Gatsby) (#924)

Author: mikeesto

src/css/variables.less

@@ -1,3 +1,6 @@
+@import url("https://fonts.googleapis.com/css?family=Rubik:300|Roboto:300");
+@import url("https://fonts.googleapis.com/css?family=Roboto+Mono:400,400i,600");
+
 /* https://www.pantone.com/color-finder/Rhodamine-Red-C */
 @dark-color: #171E26;
 @rhodamine-color: #E10098;