Add basic print styles

- Hide menu, social share buttons, and ads on print
- Close #191

Author: mmistakes

_sass/print.scss

@@ -0,0 +1,16 @@
+/* ==========================================================================
+   PRINT STYLES
+   ========================================================================== */
+
+/* 
+   Hide the following elements on print
+   ========================================================================== */
+
+@media print {
+  .top-navigation, 
+  .social-share, 
+  .related-articles,
+  .google-ads {
+    display: none;
+  }
+}

assets/css/main.scss

@@ -25,4 +25,5 @@ sitemap: false
 @import "page";
 @import "vendor/font-awesome/font-awesome";
 @import "vendor/magnific-popup/magnific-popup";
-//@import "vendor/google/fonts";
+//@import "vendor/google/fonts";
+@import "print";