README: reduce diagram edge fan-in to try to fix the blank gap under it

8 dotted 'reports to' edges converging on 2 nodes was likely forcing
Mermaid's layout engine to reserve extra vertical space for edge
routing in the LR diagram, leaving a large blank area below the
visible nodes. Reduced to 2 representative edges - can't verify the
actual render myself, this is a targeted guess to test.

README.md

@@ -99,15 +99,8 @@ flowchart LR
     Apps -.proxied.-> EdgeProxy
     SSO -.auth.-> EdgeProxy
 
-    Apps -.-> Monitoring["Monitoring"]
-    Automation -.-> Monitoring
-    FileServer -.-> Monitoring
-    EdgeProxy -.-> Monitoring
-
-    Apps -.-> SecMon["Security Monitoring"]
-    Automation -.-> SecMon
-    FileServer -.-> SecMon
-    EdgeProxy -.-> SecMon
+    Automation -.-> Monitoring["Monitoring"]
+    Automation -.-> SecMon["Security Monitoring"]
 
     classDef edge fill:#f8cecc,stroke:#b85450,color:#333
     classDef core fill:#dae8fc,stroke:#6c8ebf,color:#333