design: change color of links in dark mode

assets/css/custom.css

@@ -39,10 +39,18 @@ nav a {
   color: #422eff;
   border-bottom: 1px solid #00ff9c;
 }
+.dark a {
+  color: rgb(82, 174, 255);
+  border-bottom: 1px solid rgb(0, 204, 125);
+}
 .light a:hover {
   color: #000;
   background-color: #00ff9c;
 }
+.dark a:hover {
+  color: #333;
+  background-color: #00ff9c;
+}
 .muted, .help-block {
   opacity: 0.70;
 }