Fix perceptibility of links in the footer

sass/_chrome.scss

@@ -146,10 +146,10 @@ footer {
   color: $muted-color;
 
   a {
-    color: $muted-color;
+    color: $muted-link-color;
 
     &:hover {
-      color: $muted-hover-color;
+      color: $muted-link-hover-color;
     }
   }
 

sass/style.scss

@@ -16,7 +16,8 @@ $breakpoint: 750px;
 $background-color: #0a0429;
 $foreground-color: #f0f0f0;
 $muted-color: #909090;
-$muted-hover-color: #c0c0c0;
+$muted-link-color: #c0c0c0;
+$muted-link-hover-color: #f0f0f0;
 $text-link-color: #f7f7b0;
 $text-link-hover-color: #f7f7b0;
 $header-bg-color: #10043e;