Merge pull request #31538 from storybookjs/docs-code-panel

Docs: Add Code panel page

Author: kylegach

docs/_assets/writing-docs/code-panel.png

@@ -0,0 +1,24 @@
+```js filename=".storybook/preview.js" renderer="common" language="js"
+export default {
+  parameters: {
+    docs: {
+      codePanel: true,
+    },
+  },
+};
+```
+
+```ts filename=".storybook/preview.ts" renderer="common" language="ts"
+// Replace your-framework with the framework you are using (e.g., react-vite, vue3-vite, angular, etc.)
+import { Preview } from '@storybook/your-framework';
+
+const preview: Preview = {
+  parameters: {
+    docs: {
+      codePanel: true,
+    },
+  },
+};
+
+export default preview;
+```