Make light-mode teal colour darker (#640)

Author: penelopeysm

theming/variables/_colors-light.scss

@@ -1,7 +1,7 @@
 @import "grays";
 
 $primary: #2780e3;
-$teal-link: #34b8bf;
+$teal-link: #3ca2a8;
 
 $links: $teal-link;
 $links-hover: lighten($links, 10%);