fix(accessibility): Changed the link color to a darker blue.

Change the link color to a darker blue to fix some of the color contrast issues.

no breaking changes

Author: chrisdemars

src/app/operators/_operator-theme.scss

@@ -2,7 +2,7 @@
 
 $operator-border: #f3f3f3;
 $operator-active: #62757f;
-$link-color: #2196f3;
+$link-color:#0a6fc2;
 
 @mixin operator-theme($theme) {
   $primary: mat-color(map-get($theme, primary));