Reapply "Merge pull request academicpages#2651 from oikos99/fix_link_contrast"

This reverts commit bff5d2b.

Author: yupeng-l-chen

_sass/_variables.scss

@@ -72,7 +72,7 @@ $primary-color              : #7a8288;
 $success-color              : #62c462;
 $warning-color              : #f89406;
 $danger-color               : #ee5f5b;
-$info-color                 : #52adc8;
+$info-color                 : #2f7f93;
 
 /* brands */
 $behance-color              : #1769FF;