chore: add margin auto to img style

Author: 56kyle

README.md

@@ -1,6 +1,6 @@
 # Cookiecutter Robust Python
 
-<p style="text-align: center"><img alt="logo" src="docs/_static/cookiecutter-robust-python-logo.png" width="25%"/></p>
+<p style="text-align: center"><img alt="logo" src="docs/_static/cookiecutter-robust-python-logo.png" style="margin: auto" width="25%"/></p>
 
 A Python project template robust enough to follow up [cookiecutter-hypermodern-python]