update docs

Author: erdogant

docs/figs/cover.png

@@ -170,7 +170,8 @@ <h1>GumRoad Products with Podcasts<a class="headerlink" href="#gumroad-products-
 <p class="admonition-title">Tip</p>
 <ol class="arabic simple">
 <li><p><a class="reference external" href="https://erdogant.gumroad.com">Gumroad products</a></p></li>
-<li><p><a class="reference external" href="https://erdogant.gumroad.com/l/PCA">Blog with podcast.</a></p></li>
+<li><p><a class="reference external" href="https://erdogant.gumroad.com/l/PCA">What are PCA Loadings, and How To Effectively Use Biplots?</a></p></li>
+<li><p><a class="reference external" href="https://erdogant.gumroad.com/l/outlier-detection-using-principal-component-analysis-with-hotellings-t2-and-spe-dmodx-methods-c9c0c76cc6c7">Outlier Detection Using Principal Component Analysis with Hotelling’s T2 and SPE/DmodX Methods.</a></p></li>
 </ol>
 </div>
 </section>

docs/figs/cover.pptx

@@ -17,7 +17,8 @@ GumRoad Products with Podcasts
 
 .. tip::
 	#. `Gumroad products <https://erdogant.gumroad.com>`_
-	#. `Blog with podcast. <https://erdogant.gumroad.com/l/PCA>`_
+	#. `What are PCA Loadings, and How To Effectively Use Biplots? <https://erdogant.gumroad.com/l/PCA>`_
+	#. `Outlier Detection Using Principal Component Analysis with Hotelling’s T2 and SPE/DmodX Methods. <https://erdogant.gumroad.com/l/outlier-detection-using-principal-component-analysis-with-hotellings-t2-and-spe-dmodx-methods-c9c0c76cc6c7>`_
 
 
 Colab Notebook

docs/figs/cover2.png

@@ -17,7 +17,8 @@ GumRoad Products with Podcasts
 
 .. tip::
 	#. `Gumroad products <https://erdogant.gumroad.com>`_
-	#. `Blog with podcast. <https://erdogant.gumroad.com/l/PCA>`_
+	#. `What are PCA Loadings, and How To Effectively Use Biplots? <https://erdogant.gumroad.com/l/PCA>`_
+	#. `Outlier Detection Using Principal Component Analysis with Hotelling’s T2 and SPE/DmodX Methods. <https://erdogant.gumroad.com/l/outlier-detection-using-principal-component-analysis-with-hotellings-t2-and-spe-dmodx-methods-c9c0c76cc6c7>`_
 
 
 Colab Notebook