add storybook accessibility plugin

Author: oli-hivemq

.storybook/main.ts

@@ -3,6 +3,7 @@ import type { StorybookConfig } from "@storybook/react-vite";
 const config: StorybookConfig = {
   stories: ["../src/**/*.mdx", "../src/**/*.stories.@(js|jsx|mjs|ts|tsx)"],
   addons: [
+    "@storybook/addon-a11y",
     "@storybook/addon-links",
     "@storybook/addon-essentials",
     "@storybook/addon-onboarding",

package.json

@@ -47,6 +47,7 @@
     "@fontsource/roboto": "^5.0.13",
     "@hivemq/ui-theme": "^0.2.1",
     "@radix-ui/react-slot": "^1.1.0",
+    "@storybook/addon-a11y": "^8.2.6",
     "@storybook/addon-essentials": "^8.2.4",
     "@storybook/addon-interactions": "^8.2.4",
     "@storybook/addon-links": "^8.2.4",