Update ecosystem_overview.md

Author: mtfishman

docs/src/ecosystem_overview.md

@@ -2,7 +2,10 @@
 
 ```mermaid
 graph TD
-    ITensors(ITensors.jl) --> ITensorBase(ITensorBase.jl)
+    ITensorNetworks(ITensorNetworks.jl) --> ITensors(ITensors.jl)
+    ITensorNetworks --> DataGraphs(DataGraphs.jl)
+    DataGraphs --> NamedGraphs(NamedGraphs.jl)
+    ITensors --> ITensorBase(ITensorBase.jl)
     ITensorBase --> NamedDimsArrays(NamedDimsArrays.jl)
     NamedDimsArrays --> SparseArraysBase(SparseArraysBase.jl)
     NamedDimsArrays --> DiagonalArrays(DiagonalArrays.jl)