feat(website): add link to markdown file

[yslpn]

Summary

• Add “View as Markdown” button next to the GitHub icon.
• Compute mdPath from the current URL via useComputed$; hide on /api/.
• Cleanup MarkdownIcon: viewBox 48×48, remove extra wrappers/ids, inherit color via currentColor.

Why

• Manually tweaking the URL to get the .md view is inconvenient; this button makes it one click to copy/share with an LLM agent.
• Improves discoverability: many users don't know the Markdown view exists; placing the button next to GitHub surfaces the feature.

Checks

• Visual: button shows on docs pages and is hidden on /api/.

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[Copilot]

Pull Request Overview

This PR adds a "View as Markdown" button to documentation pages, positioned next to the existing GitHub source code link. The button provides quick access to the raw Markdown version of documentation pages.

• Introduced a new MarkdownIcon component following the existing icon pattern
• Added computed mdPath logic to hide the button on the /api/ landing page only
• Passed mdPath through to NavButtons component and rendered conditionally

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
website/src/icons/index.ts	Exports the new MarkdownIcon component
website/src/icons/MarkdownIcon.tsx	Defines the SVG icon component for markdown with proper accessibility attributes
website/src/components/DocsLayout.tsx	Adds mdPath computation and passes it to NavButtons; renders markdown link button conditionally

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commit: ad8e388

[fabian-hiller]

Great idea! Thank you for creating this PR!