style: lighten breadcrumb colors

Author: DiogoRibeiro7

_sass/minimal-mistakes/_navigation.scss

@@ -17,6 +17,16 @@
   animation: $intro-transition;
   -webkit-animation-delay: 0.3s;
   animation-delay: 0.3s;
+  color: $muted-text-color;
+
+  a {
+    color: inherit;
+    text-decoration: none;
+
+    &:hover {
+      color: $text-color;
+    }
+  }
 
   @include breakpoint($x-large) {
     max-width: $x-large;
@@ -43,6 +53,7 @@
 
   .current {
     font-weight: bold;
+    color: $text-color;
   }
 }