Update overview.mmd

Author: sahilgundu

assets/overview.mmd

@@ -1,11 +1,5 @@
-flowchart TB
-  subgraph Perimeter[VPC‑SC + CMEK]
-    DS[(Ingestion)]
-    LS[Bronze]
-    SS[Silver]
-    BQ[(BigQuery raw/stage/gold)]
-    CMP[Orchestration]
-    DLP[PII Controls]
-  end
-  DS --> LS --> SS --> BQ --> EX[Exports]
-  CMP -. schedules .-> DS & SS & BQ & EX
+flowchart LR
+  A[Sources] --> B[Bronze (GCS)]
+  B --> C[Silver (BigQuery)]
+  C --> D[Gold (BigQuery)]
+  B -. DLQ .-> E[Dead-letter bucket]