test(storybook): stories for static text pages

Add stories for the hoe page, guide page and data page.

frontend/src/app/pages/DataPage.stories.tsx

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+import { StoryObj, Meta } from '@storybook/react';
+import { DataPage } from './DataPage';
+
+const meta = {
+  title: 'App/DataPage',
+  component: DataPage,
+} as Meta;
+type Story = StoryObj<typeof meta>;
+
+export default meta;
+
+export const Default: Story = {};

frontend/src/app/pages/GuidePage.stories.tsx

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+import { StoryObj, Meta } from '@storybook/react';
+import { GuidePage } from './GuidePage';
+
+const meta = {
+  title: 'App/GuidePage',
+  component: GuidePage,
+} as Meta;
+type Story = StoryObj<typeof meta>;
+
+export default meta;
+
+export const Default: Story = {};

frontend/src/app/pages/IntroPage.stories.tsx

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+import { StoryObj, Meta } from '@storybook/react';
+import { IntroPage } from './IntroPage';
+
+const meta = {
+  title: 'App/IntroPage',
+  component: IntroPage,
+} as Meta;
+type Story = StoryObj<typeof meta>;
+
+export default meta;
+
+export const Default: Story = {};