Add a new app: QR code generator for campaign (#75)

* Initialize a new NX project - QR campaign

* Develop QR code generator app for campaign

* Add deployment script

Add Dockerfile, docker compose, and update Nix config for deployment

* Revert package.json to fix ci

* Revert package-lock.json to ensure ci (Nix build & cache) successful

apps/qrcampaign/postcss.config.mjs

@@ -0,0 +1,9 @@
+import { join } from 'path';
+
+export default {
+  plugins: {
+    '@tailwindcss/postcss': {
+      base: join(import.meta.dirname, '../../'),
+    },
+  },
+};