Add redirects for deprecated tensor and autograd tutorial links

[KaranSinghDev]

Description

This PR adds missing URL redirects in redirects.py for the old beginner and autograd tutorial pages as they currently return 404 when access from external resources (https://docs.pytorch.org/tutorials/beginner/basics/) .

Checklist

• Only one issue is addressed in 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/3974

• 📄 Preview Python docs built from this PR

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