Redirect duplicate save/load recipes to the main save/load tutorial

[Saiteja64]

Fixes #ISSUE_NUMBER

Description

1. Currently, if there are any rst files not directly in a src directory they are not picked up by the conf.py script. Update the script to also pick up recursive directories.

2. Redirect duplicate save/load recipes to the main save/load tutorial

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.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3136

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure

As of commit 08fb23d with merge base 54273de ():

NEW FAILURE - The following job has failed:

• link check on PR / linkChecker (gh)
  ✗ [404] https://pytorch.org/tutorials/recipes/amp_recipe.html | Failed: Network error: Not Found

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[mikaylagawarecki]

Thanks! The link check failure for https://pytorch.org/tutorials/recipes/amp_recipe.html seems to be unrelated to this PR