fix icon link

README.md

@@ -1,4 +1,4 @@
-# ![icon](https://raw.githubusercontent.com/bjornFJohansson/pydna/master/docs/pics/pydna.resized.png) pydna
+# ![icon](docs/_static/pydna.resized.png) pydna
 
 | [![Tests & Coverage](https://github.com/BjornFJohansson/pydna/actions/workflows/pydna_test_and_coverage_workflow.yml/badge.svg?branch=dev_bjorn)](https://github.com/BjornFJohansson/pydna/actions/workflows/pydna_test_and_coverage_workflow.yml) | [![codecov](https://codecov.io/gh/BjornFJohansson/pydna/branch/master/graph/badge.svg)](https://codecov.io/gh/BjornFJohansson/pydna/branch/master) | [![PyPI version](https://badge.fury.io/py/pydna.svg)](https://badge.fury.io/py/pydna)                                                  | [![Google group : pydna](https://img.shields.io/badge/Google%20Group-pydna-blue.svg)](https://groups.google.com/g/pydna)              |
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