perf(ui): lighten the link color in light-mode

Author: cotes2020

_sass/colors/light-typography.scss

@@ -14,7 +14,7 @@
   --heading-color: black;
   --blockquote-border-color: #eeeeee;
   --blockquote-text-color: #9a9a9a;
-  --link-color: #2a408e;
+  --link-color: #0153ab;
   --link-underline-color: #dee2e6;
   --button-bg: #ffffff;
   --btn-border-color: #e9ecef;