Add project logo to README and documentation

The logo features a cute owl (symbol of Athena, goddess of wisdom) with
a Greek Corinthian helmet and a Python snake, representing PyAthena's
identity as a Python client for Amazon Athena.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: laughingman7743

README.rst

@@ -17,6 +17,11 @@
   :target: https://mypy-lang.org/
   :alt: mypy
 
+.. image:: docs/_static/logo.png
+  :alt: PyAthena logo
+  :align: center
+  :width: 200
+
 PyAthena
 ========
 
@@ -99,3 +104,8 @@ Links
 - PyPI Releases: https://pypi.org/project/PyAthena/
 - Source Code: https://github.com/laughingman7743/PyAthena/
 - Issue Tracker: https://github.com/laughingman7743/PyAthena/issues
+
+Logo
+----
+
+The PyAthena logo was generated using `Nano-Banana Pro <https://deepmind.google/models/gemini-image/pro/>`_ (Gemini 3 Pro Image).

docs/_static/logo.png

@@ -162,6 +162,7 @@ def setup(app):
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
 html_theme = "furo"
+html_logo = "_static/logo.png"
 html_static_path = ["_static"]
 html_css_files = [
     "custom.css",

docs/conf.py

@@ -1,5 +1,10 @@
 .. _pyathena:
 
+.. image:: _static/logo.png
+  :alt: PyAthena logo
+  :align: center
+  :width: 200
+
 PyAthena
 ========