refactor: update Storybook configuration, and enhance documentation

[AFOJ]

Summary by Sourcery

Update Storybook configuration and theming to better showcase the Flux Design System and provide an introductory documentation page.

New Features:

• Add an Introduction MDX page to Storybook describing the Flux Design System, components, themes, and linking to the GitHub repository.

Enhancements:

• Configure Storybook to load static assets from the public directory and include MDX stories.
• Customize Storybook’s manager UI theme with Flux branding, colors, typography, and sidebar root display.
• Adjust Storybook sidebar item styling and alignment via a custom manager head style block.
• Set a custom favicon and brand logo for the Storybook instance.
• Retitle existing Card and LoginDrawer stories to appear under a Showcase section in the Storybook sidebar.

[sourcery-ai]

Reviewer's Guide

Refines Storybook’s configuration and UI theming, introduces an introductory docs page, reorganizes story hierarchy, and adds brand assets (favicon and logo) for the Flux Design System.

File-Level Changes

Change	Details	Files
Enhance Storybook configuration to support static assets, MDX docs, and custom sidebar styling.	Add public directory as a static asset source for Storybook. Extend stories glob to include MDX documentation files alongside TS/JS stories. Inject custom CSS into the Storybook manager head to hide sidebar item icons and better align sidebar item content.	.storybook/main.ts
Rebrand and reorganize component stories under a new Showcase section.	Update Card story title to appear under the Showcase/Card path. Update Login Drawer story title to appear under the Showcase/Login Drawer path.	src/components/card/Card.stories.tsx src/components/login-drawer/LoginDrawer.stories.tsx
Introduce a top-level Introduction MDX docs page for the Flux Design System.	Create an Introduction page that explains the Flux Design System, components, themes, and links to the GitHub repository.	src/stories/Introduction.mdx
Configure Storybook manager theming and branding for Flux.	Set a custom light theme including colors, typography, and layout for the Storybook UI. Configure Flux branding (title and logo) and enable root-level sidebar grouping in the manager configuration.	.storybook/manager.ts
Add public-facing branded assets for Storybook and the app shell.	Add a custom favicon and configure Storybook preview head to use it. Add a Flux logo SVG used as the Storybook brand image.	.storybook/preview-head.html public/favicon.svg public/flux.svg

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[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• The Introduction.mdx file is importing Meta from @storybook/addon-docs/blocks, which is deprecated in newer Storybook versions; consider switching to @storybook/blocks to align with the current API.
• The custom sidebar CSS injected via managerHead in .storybook/main.ts could be harder to maintain as a string; consider moving this styling into a dedicated manager-head.html or CSS file so it can be edited and validated more easily.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `Introduction.mdx` file is importing `Meta` from `@storybook/addon-docs/blocks`, which is deprecated in newer Storybook versions; consider switching to `@storybook/blocks` to align with the current API.
- The custom sidebar CSS injected via `managerHead` in `.storybook/main.ts` could be harder to maintain as a string; consider moving this styling into a dedicated `manager-head.html` or CSS file so it can be edited and validated more easily.

## Individual Comments

### Comment 1
<location path=".storybook/manager.ts" line_range="7" />
<code_context>
+addons.setConfig({
+  theme: create({
+    base: 'light',
+    brandImage: './flux.svg',
+    brandTitle: 'Flux Design System',
+    brandTarget: '_self',
</code_context>
<issue_to_address>
**issue (bug_risk):** Use an absolute path for `brandImage` to align with `staticDirs` configuration.

Because `staticDirs` serves `public` from the root, `flux.svg` will be exposed as `/flux.svg`. A relative path like `'./flux.svg'` may not resolve correctly in the manager UI, so using `brandImage: '/flux.svg'` will be more reliable.
</issue_to_address>

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