Replace Astro/Strapi site with Next.js static export

- Fresh structure: Next.js App Router + Tailwind v4 at the repo root, exported
  as static files (output: export) and served by static-web-server
- Remove the Strapi CMS, Astro app, Pagefind search, comments, old scripts,
  Lighthouse config and compose files; content in content/ is now plain
  markdown with YAML frontmatter
- Pages: About, Writing, Reading (3D bookshelf) and Portfolio, styled after
  adammaj.com
- SEO: metadata and canonicals, JSON-LD, generated OG images, sitemap, robots,
  RSS and JSON feeds, llms.txt
- Umami via PUBLIC_UMAMI_SCRIPT_URL / PUBLIC_UMAMI_WEBSITE_ID (build args)
- Dockerfile builds the export and serves it with sws.toml (security headers,
  clean URLs, .well-known, OG image content type, immutable asset caching)
- Prettier and cspell for content with a husky/lint-staged pre-commit hook
- Old redirect list dropped to start from a clean slate

src/components/Layout.tsx

@@ -0,0 +1,15 @@
+import { MobileNav } from "@/components/MobileNav";
+import { Sidebar } from "@/components/Sidebar";
+
+// Mirrors adammaj.com: a 596px wrapper (Chakra container) centred on the page, with a
+// second, equally wide container inside it whose 16px padding offsets the text column.
+export function Layout({ children }: { children: React.ReactNode }) {
+  return (
+    <div className="relative mx-auto mt-16 w-full max-w-[596.161px] px-4 pb-8 md:pb-40">
+      <div className="fixed inset-x-0 top-0 z-100 hidden h-16 bg-white lg:block" />
+      <MobileNav />
+      <Sidebar />
+      <main className="relative px-4 md:w-[596.161px]">{children}</main>
+    </div>
+  );
+}