Remove unused colors from color palette

The color palette has been stripped down to a
maximum of two colors shades per palette. This
works for our design since components use a
base color with a lighter color as an accent
color. This change reduces the amount of CSS
generated by Bootstrap when the CSS is compiled.

Github Story: https://github.com/openbmc/webui-vue/issues/2

Signed-off-by: Derick Montague <derick.montague@ibm.com>
Change-Id: I2ddb37f5c89c749a7303799c6f7499ddd83d5a92
diff --git a/src/components/AppNavigation/AppNavigation.vue b/src/components/AppNavigation/AppNavigation.vue
index 173a625..48b94c3 100644
--- a/src/components/AppNavigation/AppNavigation.vue
+++ b/src/components/AppNavigation/AppNavigation.vue
@@ -195,16 +195,16 @@
   font-weight: $headings-font-weight;
   padding-left: $spacer; // defining consistent padding for links and buttons
   padding-right: $spacer;
-  color: $secondary-dark;
+  color: $secondary;
 
   &:hover {
     background-color: $primary-nav-hover;
-    color: $secondary-dark;
+    color: $dark;
   }
 
   &:focus {
     box-shadow: $btn-focus-box-shadow;
-    color: $secondary-dark;
+    color: $dark;
   }
 }
 
@@ -212,8 +212,8 @@
 .nav-link--current:hover,
 .nav-link--current:focus {
   font-weight: $headings-font-weight;
-  background-color: $secondary-dark;
-  color: $secondary-light;
+  background-color: $secondary;
+  color: $light;
   cursor: default;
 
   &::before {