Expand the use cases, move them up for discoverability (#8692)

Author: Sean Naren

docs/source/_templates/layout.html

@@ -4,7 +4,7 @@
 {% block footer %}
 {{ super() }}
 <script script type="text/javascript">
-  var collapsedSections = ['Best practices', 'Lightning API', 'Optional extensions', 'Tutorials', 'API References', 'Bolts', 'Examples', 'Common Use Cases', 'Partner Domain Frameworks', 'Community'];
+  var collapsedSections = ['Best practices', 'Lightning API', 'Optional extensions', 'Tutorials', 'API References', 'Bolts', 'Examples', 'Partner Domain Frameworks', 'Community'];
 </script>
 
 {% endblock %}

docs/source/index.rst

@@ -36,6 +36,35 @@ PyTorch Lightning Documentation
    common/lightning_module
    common/trainer
 
+.. toctree::
+   :maxdepth: 1
+   :name: Common Use Cases
+   :caption: Common Use Cases
+
+   clouds/cloud_training
+   clouds/cluster
+   common/child_modules
+   common/debugging
+   common/early_stopping
+   common/hyperparameters
+   common/production_inference
+   advanced/ipu
+   common/lightning_cli
+   advanced/lr_finder
+   common/loggers
+   advanced/multi_gpu
+   advanced/advanced_gpu
+   common/weights_loading
+   common/optimizers
+   advanced/profiler
+   advanced/sequences
+   common/single_gpu
+   advanced/training_tricks
+   advanced/pruning_quantization
+   advanced/transfer_learning
+   advanced/tpu
+   common/test_set
+
 .. toctree::
    :maxdepth: 2
    :name: docs
@@ -96,35 +125,6 @@ PyTorch Lightning Documentation
    SimCLR <https://lightning-bolts.readthedocs.io/en/latest/self_supervised_models.html#simclr>
    VAE <https://lightning-bolts.readthedocs.io/en/latest/autoencoders.html#basic-vae>
 
-.. toctree::
-   :maxdepth: 1
-   :name: Common Use Cases
-   :caption: Common Use Cases
-
-   clouds/cloud_training
-   clouds/cluster
-   common/child_modules
-   common/debugging
-   common/early_stopping
-   common/hyperparameters
-   common/production_inference
-   advanced/ipu
-   common/lightning_cli
-   advanced/lr_finder
-   common/loggers
-   advanced/multi_gpu
-   advanced/advanced_gpu
-   common/weights_loading
-   common/optimizers
-   advanced/profiler
-   advanced/sequences
-   common/single_gpu
-   advanced/training_tricks
-   advanced/pruning_quantization
-   advanced/transfer_learning
-   advanced/tpu
-   common/test_set
-
 .. toctree::
    :maxdepth: 1
    :name: Partner Domain Frameworks