update font family as per design

Author: amarantha-k

src/css/base.css

@@ -16,7 +16,7 @@ body {
 
 body {
   color: var(--color-text);
-  font-family: "Source Sans Pro", sans-serif;
+  font-family: "Open Sans", sans-serif;
   /* font-family: "Gotham", sans-serif; */
   line-height: var(--line-height-body);
   margin: 0;
@@ -60,7 +60,7 @@ code,
 kbd,
 pre {
   /* font-family: "Roboto Mono", monospace; */
-  font-family: "Source Sans Pro", sans-serif;
+  font-family: "Source Sans Code", sans-serif;
 }
 
 code {