Show all Learn the Basics content in the Left Nav (#1468)

* Show all Learn the Basics content in the Left Nav

Testing out the look of creating a separate heading in the left nav for all the learn the basics content.

* Collapse Learning PyTorch by default

With the addition of the Introduction to PyTorch (Learn the Basics) section on the left nav, we now want to collapse the original Learning PyTorch section.

Author: holly1238

_templates/layout.html

@@ -75,7 +75,7 @@
 </noscript>
 
 <script type="text/javascript">
-  var collapsedSections = ['PyTorch Recipes', 'Image and Video', 'Audio', 'Text', 'Reinforcement Learning', 'Deploying PyTorch Models in Production', 'Code Transforms with FX', 'Frontend APIs', 'Extending PyTorch', 'Model Optimization', 'Parallel and Distributed Training', 'Mobile'];
+  var collapsedSections = ['PyTorch Recipes', 'Learning PyTorch', 'Image and Video', 'Audio', 'Text', 'Reinforcement Learning', 'Deploying PyTorch Models in Production', 'Code Transforms with FX', 'Frontend APIs', 'Extending PyTorch', 'Model Optimization', 'Parallel and Distributed Training', 'Mobile'];
 </script>
 
 <img height="1" width="1" style="border-style:none;" alt="" src="https://www.googleadservices.com/pagead/conversion/795629140/?label=txkmCPmdtosBENSssfsC&amp;guid=ON&amp;script=0"/>

index.rst

@@ -531,9 +531,24 @@ Additional Resources
    :maxdepth: 2
    :hidden:
    :includehidden:
-   :caption: Learning PyTorch
+   :caption: Introduction to PyTorch
 
    beginner/basics/intro
+   beginner/basics/quickstart_tutorial
+   beginner/basics/tensorqs_tutorial
+   beginner/basics/data_tutorial
+   beginner/basics/transforms_tutorial
+   beginner/basics/buildmodel_tutorial
+   beginner/basics/autogradqs_tutorial
+   beginner/basics/optimization_tutorial
+   beginner/basics/saveloadrun_tutorial
+   
+.. toctree::
+   :maxdepth: 2
+   :hidden:
+   :includehidden:
+   :caption: Learning PyTorch
+
    beginner/deep_learning_60min_blitz
    beginner/pytorch_with_examples
    beginner/nn_tutorial