fix accessibility issues

lib/cannery_web/components/core_components/topbar.html.heex

@@ -1,4 +1,4 @@
-<nav role="navigation" class="mb-8 px-8 py-4 w-full bg-primary-400">
+<nav role="navigation" class="mb-8 px-8 py-4 w-full bg-primary-500">
   <div class="flex flex-col sm:flex-row justify-between items-center">
     <div class="mb-4 sm:mb-0 sm:mr-8 flex flex-row justify-start items-center space-x-2">
       <.link
@@ -87,6 +87,7 @@
             href={Routes.user_session_path(Endpoint, :delete)}
             method="delete"
             data-confirm={dgettext("prompts", "Are you sure you want to log out?")}
+            aria-label={gettext("Log out")}
           >
             <i class="fas fa-sign-out-alt"></i>
           </.link>
@@ -101,6 +102,7 @@
           <.link
             navigate={Routes.live_dashboard_path(Endpoint, :home)}
             class="text-white hover:underline"
+            aria-label={gettext("Live Dashboard")}
           >
             <i class="fas fa-gauge"></i>
           </.link>