Add .md URL stripping redirects for legacy links

[LucHeart]

Motivation

• Preserve compatibility with legacy markdown-style links by redirecting any incoming path that ends with .md to the same path without the extension so old links keep working.

Description

• Add a dev-time Next.js redirect in next.config.mjs that permanently maps /:path*.md to /:path* so local/dev server behavior matches production.
• Add production redirect rules in public/_redirects to strip .md on Cloudflare Pages and include a specific /legal/*.md mapping to /home/legal/:splat while keeping existing root/legal rules.

Testing

• Ran pnpm lint which passed with no warnings or errors.
• Ran pnpm build which completed successfully and generated the static pages without errors.

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Codex Task

[cloudflare-workers-and-pages]

Deploying openshock-wiki with    Cloudflare Pages

Latest commit:	934a33f
Status:	✅  Deploy successful!
Preview URL:	https://629d4cb8.openshock-wiki.pages.dev
Branch Preview URL:	https://codex-add-redirect-for--md-l.openshock-wiki.pages.dev

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

* Exclude llms markdown endpoints from .md redirect

The new catch-all rule /*.md -> /:splat also matches internal markdown endpoints such as /llms.mdx/docs/.../content.md, which are intentionally generated by getPageMarkdownUrl and exported from src/app/llms.mdx/docs/[[...slug]]/route.ts using generateStaticParams. Redirecting those requests to /.../content strips the required .md segment, so production static exports no longer have a matching file at the redirected path, causing markdown-view/copy links to fail with 404s.

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