docs: setting cron for periodical update tutorials

[Borda]

What does this PR do?

this helps to keep the tutorials updated...
Tutorials will also have periodical rebuild to keep up-to-speed

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📚 Documentation preview 📚: https://pytorch-lightning--18783.org.readthedocs.build/en/18783/

cc @Borda @carmocca

[github-actions]

⚡ Required checks status: All passing 🟢

No groups match the files changed in this PR.

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Thank you for your contribution! 💜

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[Borda]

checking the lts issue, resolution in git-lfs/git-lfs#911 (comment)