Remove book "Learning Python" since free version is outdated-2013

Author: RDjarbeng

0_python_for_ml/intro_to_python.ipynb

@@ -5152,7 +5152,7 @@
     "**Books:**\n",
     "\n",
     "2. [Automate the Boring Stuff with Python](https://automatetheboringstuff.com/#toc) by Al Sweigart - Teaches Python through practical examples and automation tasks.\n",
-    "3. \"Learning Python\" by Mark Lutz - Comprehensive book for beginners, covering Python syntax and concepts.\n",
+    "\n",
     "4. \"Python for Data Analysis\" by Wes McKinney - Focuses on using Python for data manipulation and analysis.\n",
     "5. \"Fluent Python\" by Luciano Ramalho - A more advanced book that delves into Python's intricacies and best practices.\n",
     "\n",