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/app/feed.json/route.ts

@@ -0,0 +1,29 @@
+import { getFeedItems } from "@/lib/feed";
+import { abs, site } from "@/lib/site";
+
+export const dynamic = "force-static";
+
+export async function GET() {
+  const items = await getFeedItems();
+  const feed = {
+    version: "https://jsonfeed.org/version/1.1",
+    title: site.name,
+    home_page_url: site.baseUrl,
+    feed_url: abs("/feed.json"),
+    description: site.description,
+    language: "en",
+    authors: [{ name: site.name, url: site.baseUrl }],
+    items: items.map((i) => ({
+      id: i.url,
+      url: i.url,
+      title: i.title,
+      summary: i.description,
+      content_html: i.html,
+      date_published: i.date.toISOString(),
+      tags: i.tags,
+    })),
+  };
+  return new Response(JSON.stringify(feed), {
+    headers: { "Content-Type": "application/feed+json; charset=utf-8" },
+  });
+}