Fix global font weight

Author: Edward Navarro

src/components/index.scss

@@ -1,5 +1,5 @@
 @import url('https://fonts.googleapis.com/css?family=IBM+Plex+Mono:400,500,600');
-@import url('https://fonts.googleapis.com/css?family=IBM+Plex+Sans:400');
+@import url('https://fonts.googleapis.com/css?family=IBM+Plex+Sans:400,500,600');
 @import './common.scss';
 
 :root,
@@ -26,7 +26,7 @@ body {
   margin: 0;
   padding: 0;
   font-family: $font-body;
-  font-weight: $font-weight-medium;
+  font-weight: $font-weight-regular;
   background-color: var(--color-background);
   color: var(--color-text);
   font-size: 14px;