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

.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+  "recommendations": [
+    "biomejs.biome",
+    "esbenp.prettier-vscode",
+    "streetsidesoftware.code-spell-checker"
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,12 @@
+{
+  "editor.formatOnSave": true,
+  "editor.defaultFormatter": "biomejs.biome",
+  "[markdown]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.wordWrap": "on"
+  },
+  "prettier.enable": true,
+  "cSpell.language": "en",
+  "cSpell.enabledFileTypes": { "markdown": true },
+  "editor.codeActionsOnSave": { "source.fixAll.biome": "explicit" }
+}