FIX: add python logo to static images

Author: miykael

docs/notebooks/introduction_python.html

@@ -11795,7 +11795,7 @@
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-<div align="center"><img src="https://www.python.org/static/img/python-logo.png"></div><h1 id="Python">Python<a class="anchor-link" href="#Python">&#182;</a></h1><p>This section is meant as a general introduction to Python and is by far not complete. It is based amongst others on the <a href="http://github.com/jrjohansson/scientific-python-lectures">IPython notebooks from J. R. Johansson</a>, on <a href="http://www.stavros.io/tutorials/python/">http://www.stavros.io/tutorials/python/</a> and on <a href="http://www.swaroopch.com/notes/python">http://www.swaroopch.com/notes/python</a>.</p>
+<center><img src="../static/images/python.png" width=400></center></div><h1 id="Python">Python<a class="anchor-link" href="#Python">&#182;</a></h1><p>This section is meant as a general introduction to Python and is by far not complete. It is based amongst others on the <a href="http://github.com/jrjohansson/scientific-python-lectures">IPython notebooks from J. R. Johansson</a>, on <a href="http://www.stavros.io/tutorials/python/">http://www.stavros.io/tutorials/python/</a> and on <a href="http://www.swaroopch.com/notes/python">http://www.swaroopch.com/notes/python</a>.</p>
 <p><font color='red'>Important:</font> a very good interactive tutorial for Python can also be found on <a href="https://www.codecademy.com/learn/python">https://www.codecademy.com/learn/python</a></p>
 
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docs/static/images/python.png

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "<div align=\"center\"><img src=\"https://www.python.org/static/img/python-logo.png\"></div>\n",
+    "<center><img src="../static/images/python.png" width=400></center>\n",
     "\n",
     "# Python\n",
     "\n",