Move sharp to dependencies not just dev time

Author: martinwoodward

package.json

@@ -40,6 +40,7 @@
     "remark-gfm": "^4.0.1",
     "remark-toc": "^9.0.0",
     "sanitize-html": "^2.17.0",
+    "sharp": "0.34.3",
     "striptags": "^3.2.0",
     "swiper": "^11.2.5",
     "vite": "^7.1.4"
@@ -59,7 +60,6 @@
     "prettier-plugin-astro": "^0.14.1",
     "prettier-plugin-tailwindcss": "^0.6.11",
     "sass": "^1.85.1",
-    "sharp": "0.34.3",
     "tailwindcss": "^4.1.12",
     "typescript": "^5.8.2"
   }