fixes #4505: lighten navbar text and link color so hover looks darker

docs/assets/css/bootstrap-responsive.css

@@ -944,14 +944,14 @@
     display: none;
   }
   .nav-collapse .nav .nav-header {
-    color: #555555;
+    color: #777777;
     text-shadow: none;
   }
   .nav-collapse .nav > li > a,
   .nav-collapse .dropdown-menu a {
     padding: 9px 15px;
     font-weight: bold;
-    color: #555555;
+    color: #777777;
     -webkit-border-radius: 3px;
        -moz-border-radius: 3px;
             border-radius: 3px;

docs/assets/css/bootstrap.css

@@ -4032,7 +4032,7 @@ input[type="submit"].btn.btn-mini {
   *z-index: 2;
   margin-bottom: 20px;
   overflow: visible;
-  color: #555555;
+  color: #777777;
 }
 
 .navbar-inner {
@@ -4071,7 +4071,7 @@ input[type="submit"].btn.btn-mini {
   margin-left: -20px;
   font-size: 20px;
   font-weight: 200;
-  color: #555555;
+  color: #777777;
   text-shadow: 0 1px 0 #ffffff;
 }
 
@@ -4085,7 +4085,7 @@ input[type="submit"].btn.btn-mini {
 }
 
 .navbar-link {
-  color: #555555;
+  color: #777777;
 }
 
 .navbar-link:hover {
@@ -4256,7 +4256,7 @@ input[type="submit"].btn.btn-mini {
 .navbar .nav > li > a {
   float: none;
   padding: 10px 15px 10px;
-  color: #555555;
+  color: #777777;
   text-decoration: none;
   text-shadow: 0 1px 0 #ffffff;
 }
@@ -4386,8 +4386,8 @@ input[type="submit"].btn.btn-mini {
 }
 
 .navbar .nav li.dropdown > .dropdown-toggle .caret {
-  border-top-color: #555555;
-  border-bottom-color: #555555;
+  border-top-color: #777777;
+  border-bottom-color: #777777;
 }
 
 .navbar .nav li.dropdown.open > .dropdown-toggle .caret,

less/variables.less

@@ -158,8 +158,8 @@
 @navbarBackground:                darken(@navbarBackgroundHighlight, 5%);
 @navbarBorder:                    darken(@navbarBackground, 12%);
 
-@navbarText:                      @gray;
-@navbarLinkColor:                 @gray;
+@navbarText:                      #777;
+@navbarLinkColor:                 #777;
 @navbarLinkColorHover:            @grayDark;
 @navbarLinkColorActive:           @gray;
 @navbarLinkBackgroundHover:       transparent;