Exporting a Model from PyTorch to ONNX tutorial - Docathon

[diningeachox]

Fixes #2902

Description

Adds a timing script to the tutorial page to compare inference times between pytorch and ONNX models.
Fixed one of the external links at the bottom of the page.
Displays low-res and super-res images next to each other so readers can see a comparison.

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

cc @xadupre @sekyondaMeta @svekars @kit1980 @brycebortree, @titaiwangms and @thiagocrepaldi

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2935

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure

As of commit c42a711 with merge base ef9750a ():

NEW FAILURE - The following job has failed:

• Build tutorials / pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu) (gh)
  Process completed with exit code 2.

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[svekars]

@xadupre, @titaiwangms @thiagocrepaldi

[titaiwangms]

Thanks!