added font weight 300 into the open sans for home page

services/web/public/stylesheets/core/variables.less

@@ -49,7 +49,7 @@
 //
 //## Font, line-height, and color for body text, headings, and more.
 
-@import url(//fonts.googleapis.com/css?family=Open+Sans:400,600,700);
+@import url(//fonts.googleapis.com/css?family=Open+Sans:300,400,600,700);
 @import url(//fonts.googleapis.com/css?family=PT+Serif:400,600,700);
 
 @font-family-sans-serif:  "Open Sans", sans-serif;