Trim down font download

Author: josevalim

src/css/main.css

@@ -7,7 +7,7 @@
 @import "./js_interop.css";
 @import "./tooltips.css";
 
-@import url("https://fonts.googleapis.com/css2?family=Roboto:wght@300&family=Source+Sans+Pro:wght@400;600;700;900&display=swap");
+@import url("https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@600&display=swap");
 
 html {
   scroll-behavior: smooth;