Improve code examples

[danieljanes]

Describe the type of feature and its functionality.

There's room for improvement when it comes to the general structure of our code examples. Issues include:

• inconsistent naming of code examples across different frameworks
• multiple code examples covering the same topic in different ways
• at least one obsolete code example
• inconsistent naming: - vs _

Describe step by step what files and adjustments are you planning to include.

Here's a table of all code examples (see column 2 "Current name"). The proposed name for each code examples is shown in column 1 to make it easy to see what the final structure would look like. Empty rows divide the code examples covering PyTorch, TensorFlow, and everything else. The last column details the proposed next step for each example:

Done	Proposed name	Current name	Framework	Topic	Next step
☑️	quickstart_pytorch	quickstart_pytorch	PyTorch	quickstart
	-	pytorch_from...	PyTorch	from...to
	advanced_pytorch	advanced_pytorch	PyTorch	advanced	make it faster
	differential_privacy_pytorch	opacus	PyTorch	dp
	simulation_pytorch	simulation_pytorch	PyTorch	sim
✅	-	simulation_pytorch_legacy	PyTorch	sim	DELETE
	edge_pytorch	embedded_devices	PyTorch	edge
	-	pytorch_federated_variational_autoencode	PyTorch	application
---	---	---	---	---	---
☑️	quickstart_tensorflow	quickstart_tensorflow	TensorFlow	quickstart
	advanced_tensorflow	advanced_tensorflow	TensorFlow	advanced
	differential_privacy_tensorflow	dp-sgd-mnist	TensorFlow	dp	RENAME to differential_privacy_tensorflow
✅	simulation_tensorflow	quickstart_simulation	TensorFlow	sim	Rename to simulation_tensorflow
✅	-	simulation	TensorFlow	sim	DELETE
	edge_tensorflow	android	TFLite	edge
---	---	---	---	---	---
	quickstart_cpp	quickstart_cpp	C++	quickstart
	quickstart_huggingface	quickstart_huggingface	HuggingFace	quickstart	Question: rename to quickstart_transformers?
	quickstart_mlcube	quickstart_mlcube	MLCube	quickstart
☑️	quickstart_mxnet	quickstart_mxnet	MXNet	quickstart
	quickstart_pytorch_lightning	quickstart_pytorch_lightning	PyTorch Lightning	quickstart	Question: rename to quickstart_lightning?
✅	quickstart_jax	jax_from...	JAX	from...to	RENAME TO quickstart_jax
	quickstart_scikit_learn	sklearn-logred-mnist	scikit-learn	quickstart	RENAME to quickstart_scikit_learn
	-	mxnet_from...	MXNet	from...to	options: delete, merge with quickstart_mxnet, rename to advanced_mxnet

Is there something else you want to add?

Open questions:

• Should we use _ or - as separators? Proposal: use - because example names might be used in auto-generated URL's (which so far use - separators on flower.dev).