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

public/.well-known/pgp-key.txt

@@ -0,0 +1,13 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+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+=uKsS
+-----END PGP PUBLIC KEY BLOCK-----

public/.well-known/security.txt

@@ -0,0 +1,17 @@
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA512
+
+Contact: mailto:[email protected]
+Expires: 2027-07-16T00:00:00.000Z
+Encryption: https://andwati.com/.well-known/pgp-key.txt
+Encryption: https://keys.openpgp.org/vks/v1/by-fingerprint/AD58AAB7A20D8523CBF59A791F20FED0AA05B0DA
+Encryption: https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xAD58AAB7A20D8523CBF59A791F20FED0AA05B0DA
+Preferred-Languages: en
+Canonical: https://andwati.com/.well-known/security.txt
+-----BEGIN PGP SIGNATURE-----
+
+iHUEARYKAB0WIQStWKq3og2FI8v1mnkfIP7QqgWw2gUCaljXlQAKCRAfIP7QqgWw
+2qAoAP0Q7Cc0YsP2dvV7fqDlqcnjuJepQQSTZBz7ehkPyjGV5gEA3K9ZqQmuI2ea
+KKADWxuKTTY43PBmuV9rMqLm8ZOPlAY=
+=NUkY
+-----END PGP SIGNATURE-----