try mermaid in gh

Author: nbbeeken

etc/charts/README.md

@@ -39,7 +39,31 @@ There are four main error classes which stem from `MongoError`: `MongoDriverErro
 
 The base class from which all errors in the Node driver subclass.
 `MongoError` should **never** be be directly instantiated.
-![(MongoError hierarchy tree)](../charts/imgs/MongoError.svg)
+
+```mermaid
+graph TD
+    MongoError --- MongoDriverError
+    MongoError --- MongoNetworkError
+    MongoError --- MongoServerError
+    MongoError --- MongoSystemError
+    MongoDriverError --- MongoAPIError
+    MongoDriverError --- MongoRuntimeError
+
+linkStyle 0 stroke:#116149
+linkStyle 1 stroke:#116149
+linkStyle 2 stroke:#116149
+linkStyle 3 stroke:#116149
+linkStyle 4 stroke:#116149
+linkStyle 5 stroke:#116149
+
+style MongoError fill:#13aa52,stroke:#21313c,color:#FAFBFC
+style MongoSystemError fill:#13aa52,stroke:#21313c,color:#FAFBFC
+style MongoNetworkError fill:#13aa52,stroke:#21313c,color:#FAFBFC
+style MongoServerError fill:#13aa52,stroke:#21313c,color:#FAFBFC
+style MongoDriverError fill:#13aa52,stroke:#21313c,color:#FAFBFC
+style MongoAPIError fill:#13aa52,stroke:#21313c,color:#FAFBFC
+style MongoRuntimeError fill:#13aa52,stroke:#21313c,color:#FAFBFC
+```
 
 Children of `MongoError` include: