chore: track site sources + ignore local env/backups

package.json

@@ -6,9 +6,23 @@
     "dev": "astro dev",
     "build": "astro build",
     "preview": "astro preview",
-    "astro": "astro"
+    "astro": "astro",
+    "postbuild": "npx pagefind --site dist",
+    "import": "node scripts/import-docx.mjs"
   },
   "dependencies": {
+    "@astrojs/mdx": "^4.3.13",
     "astro": "^5.16.11"
+  },
+  "engines": {
+    "node": ">=22 <23",
+    "npm": ">=10 <11"
+  },
+  "devDependencies": {
+    "@astrojs/sitemap": "^3.7.0",
+    "pagefind": "^1.4.0",
+    "rehype-autolink-headings": "^7.1.0",
+    "rehype-slug": "^6.0.0",
+    "unist-util-visit": "^5.0.0"
   }
-}
+}