Accessibility fixes:

	- changed buttons to spans since not being used in forms
	- added aria roles to html elements
	- changed low contrast colors

Change-Id: I56e784b226baa7f9b24346446a0a023fcea633d4
Signed-off-by: Michael Davis <michael.s.davis@ibm.com>
diff --git a/app/common/styles/directives/app-navigation.scss b/app/common/styles/directives/app-navigation.scss
index 997ab7c..f91457c 100644
--- a/app/common/styles/directives/app-navigation.scss
+++ b/app/common/styles/directives/app-navigation.scss
@@ -51,7 +51,7 @@
   .nav-icon {
     @include navIcons;
   }
-  .button, button, a {
+  .button, a, .nav__btn {
     background: transparent;
     height: auto;
     border: 0;
@@ -84,6 +84,7 @@
       padding: 1em;
       border-radius: 0;
       border-bottom: 1px solid $lightgrey;
+      cursor: pointer;
       .nav__icon-help__outer {
         stroke: $black;
       }