corrected path of the flow image

Author: kmahajan-cadfem

README.md

@@ -39,7 +39,7 @@ The data in DPF is defined based on physics-agnostic mathematical quantities
 described in self-sufficient entities called **fields**. This allows DPF to be 
 a modular and easy-to-use tool with a large range of capabilities.
 
-![DPF flow](https://github.com/ansys/pydpf-core/raw/main/docs/source/images/drawings/dpf-flow.png "DPF flow")
+![DPF flow](./doc/source/images/drawings/dpf-flow.png "DPF flow")
 
 The ``ansys.dpf.core`` package provides a Python interface to DPF, enabling
 rapid postprocessing of a variety of Ansys file formats and physics solutions