fixed links to have underlines

assets/css/style.scss

@@ -32,16 +32,18 @@ details {
 
 a {
     color: $link-color;
+    text-decoration: underline;
 }
 
 a:visited {
     color: $link-visited-color;
-    text-decoration: none;
+    text-decoration: underline;
 }
 
 
 a:hover, a:active, a:focus {
     color: $link-hover-color;
+    text-decoration: underline;
 }
 
 .navbar .navbar-expand-lg .navbar-dark {