Enhances CDK deployment process and documentation

Improves the deployment script to use the UAE  region and adds context for the CDK stack.

infrastructure/app.ts

@@ -8,8 +8,8 @@ const app = new cdk.App();
 new BackendStack(app, 'SyncrowBackendStack', {
   env: {
     account: process.env.CDK_DEFAULT_ACCOUNT,
-    region: process.env.CDK_DEFAULT_REGION,
+    region: 'me-central-1',
   },
   databaseName: 'syncrow',
-  certificateArn: app.node.tryGetContext('certificateArn'),
+  certificateArn: 'arn:aws:acm:me-central-1:482311766496:certificate/bea1e2ae-84a1-414e-8dbf-4599397e7ed0',
 });