Fixed hover color on link to home button (#181)

* fixed hover on home link to change color

* updated css to be cleaner

amundsen_application/static/js/components/NavBar/styles.scss

@@ -19,7 +19,8 @@
   color: $text-medium;
 }
 
-.nav-bar a:hover {
+.nav-bar a:hover,
+.nav-bar a:hover span {
   color: $brand-color-4;
 }