docs: datasets.rst torchtune tutorial is deprecated

[ChristianZaccaria]

System Info

Detailed Documentation bug.

Information

• The official example scripts
• My own modified scripts

🐛 Describe the bug

The datasets.rst from the list of document urls as it no longer exists in torchtune. Referenced PR: pytorch/torchtune#1781

Error logs

Additionally, in the same document, we need to add a step to run uv sync to enable us to run the llama commands.

➜  llama-stack git:(remove-deprecated-rst) uv venv --python 3.10
source .venv/bin/activate
Using CPython 3.10.13 interpreter at: /usr/bin/python3.10
Creating virtual environment at: .venv
Activate with: source .venv/bin/activate
(llama-stack) ➜  llama-stack git:(remove-deprecated-rst) INFERENCE_MODEL=llama3.2:3b llama stack build --template ollama --image-type venv --run
zsh: llama: command not found...

Expected behavior

No errors.

[ChristianZaccaria]

/assign @ChristianZaccaria