Add Compiler category in left nav

[svekars]

• Add a Compiler category in left nav and torch.compile tutorials there
• Ad Compiler tag to relevant tutorials

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3184

• 📄 Preview Python docs built from this PR

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 7c83408 with merge base 1437a21 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Check spelling / pyspelling (gh) (trunk failure)
  Process completed with exit code 1.

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