Update documentation

README.html

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         <p aria-level="2" class="caption" role="heading"><span class="caption-text">Basic level</span></p>
 <ul class="nav bd-sidenav">
 <li class="toctree-l1"><a class="reference internal" href="python_notebooks/basic/Lecture_1.html">1. Github Introduction</a></li>
-<li class="toctree-l1"><a class="reference internal" href="python_notebooks/basic/Lecture_2.html">2. Introduction to Python: Tuples, Lists, Dictionaries, Arrays</a></li>
+<li class="toctree-l1"><a class="reference internal" href="python_notebooks/basic/Lecture_2.html">2. Introduction to Python: Lists, Tuples, Dictionaries, Arrays</a></li>
 <li class="toctree-l1"><a class="reference internal" href="python_notebooks/basic/Lecture_3.html">3. Pandas</a></li>
 <li class="toctree-l1"><a class="reference internal" href="python_notebooks/basic/Lecture_4.html">4. If and Loops</a></li>
 <li class="toctree-l1"><a class="reference internal" href="python_notebooks/basic/Lecture_5.html">5. Functions and Class</a></li>
@@ -169,6 +169,7 @@
 <li class="toctree-l1"><a class="reference internal" href="python_notebooks/intermediate/Lecture_10.html">10. Geopandas</a></li>
 <li class="toctree-l1"><a class="reference internal" href="python_notebooks/intermediate/Lecture_11.html">11. Folium</a></li>
 <li class="toctree-l1"><a class="reference internal" href="python_notebooks/intermediate/Lecture_12.html">12.  Causal Inference</a></li>
+<li class="toctree-l1"><a class="reference internal" href="python_notebooks/intermediate/Lecture_13.html">13. Natural Language Processing (NLP)</a></li>
 </ul>
 
     </div>

_sources/intro.md

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-# Python Intensive Course 
+# Python Intensive Course
 
-This book contains the lectures of [Python Intensive Course](https://github.com/alexanderquispe/Diplomado_PUCP), Specialization in Data Science for Social Sciences and Public Management, hosted by [Pontifia Universidad Católica del Perú](https://www.pucp.edu.pe/). 
+This book contains the lectures of [Python Intensive Course](https://github.com/alexanderquispe/Diplomado_PUCP), Specialization in Data Science for Social Sciences and Public Management, hosted by [QLAB | Pontificia Universidad Católica del Perú](https://qlab.pucp.edu.pe/).
 
 ```{admonition} Attribution 
 The content was taught in two specific courses “Fundamentals of Python” & “Python Intermediate”, both were developed by [Alexander Quispe](https://alexanderquispe.github.io/) and [Anzony Quispe](https://anzonyquispe.github.io/).
 ```
-    
+
 ## Lectures
 
 ```{tableofcontents}