add a11y addon to rose storybook

addons/rose/.storybook/main.js

@@ -9,6 +9,7 @@ module.exports = {
     '@storybook/addon-knobs',
     '@storybook/addon-actions',
     '@storybook/addon-docs',
+    '@storybook/addon-a11y',
   ],
   emberOptions: {
     polyfills: [namedBlockPolyfill],

addons/rose/package.json

@@ -44,6 +44,7 @@
     "@glimmer/component": "^1.0.4",
     "@glimmer/tracking": "^1.0.4",
     "@hashicorp/flight-icons": "^1.0.0",
+    "@storybook/addon-a11y": "^6.3.12",
     "@storybook/addon-actions": "^6.3.10",
     "@storybook/addon-docs": "^6.3.8",
     "@storybook/addon-knobs": "^6.3.1",

addons/rose/tests/dummy/app/styles/app.scss

@@ -12,6 +12,7 @@
   border-radius: 4px;
   margin: 0 0.5rem 0.5rem 0 !important;
   box-shadow: 0px 3px 6px rgba(var(--stark-components), var(--opacity-3));
+  list-style-type: none;
 
   code {
     display: block !important;