fix: Add sharp for production image optimization

- Sharp required for Next.js image optimization in production
- Fixes: sharp is required to be installed in standalone mode
- Added as production dependency (--save)

package.json

@@ -20,6 +20,7 @@
     "remark": "^15.0.1",
     "remark-gfm": "^4.0.1",
     "remark-html": "^16.0.1",
+    "sharp": "^0.34.5",
     "tailwind-merge": "^2.3.0"
   },
   "devDependencies": {