build(deps): update to Next.js v16 + use image digests instead of tags

Ref:
- https://docs.docker.com/dhi/core-concepts/digests/
- https://github.com/goldbergyoni/nodebestpractices/blob/master/sections/docker/image-tags.md
- https://emmer.dev/blog/what-is-a-docker-digest/

apps/website/package.json

@@ -7,8 +7,8 @@
     "#*": "./*"
   },
   "scripts": {
-    "dev": "next dev --port 3000 --turbopack",
-    "build": "next build --turbopack",
+    "dev": "next dev --port 3000",
+    "build": "next build",
     "start": "next start --port 3000",
     "typegen": "next typegen",
     "lint:eslint": "eslint app --max-warnings 0",