fix: site/docs

Author: prih

site/docs/security/access-control.md

@@ -32,19 +32,6 @@ When a user accesses a graph, their effective permission is resolved through a 5
 5. server.defaultAccess       ← fallback
 ```
 
-```mermaid
-flowchart TD
-    A[Request access to graph] --> B{graph.access[userId]?}
-    B -->|found| R1[Return permission]
-    B -->|not found| C{project.access[userId]?}
-    C -->|found| R2[Return permission]
-    C -->|not found| D{workspace.access[userId]?}
-    D -->|found| R3[Return permission]
-    D -->|not found| E{server.access[userId]?}
-    E -->|found| R4[Return permission]
-    E -->|not found| F[Return server.defaultAccess]
-```
-
 This means you can set a broad default and override it at any level.
 
 ## Default behavior