backup.md: mention restore from backup

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• Close #184 (closed)
• Staging: https://docs.binary.picodata.io/picodata/branch-backup_restore/

added docs: update + 1 deleted label

assigned to @a.tolstoy

approved this merge request

added 5 commits

• b6141fac...8c1c3db9 - 4 commits from branch main
• 11b88149 - backup.md: mention restore from backup

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changed milestone to %Picodata 24.2 — Замечания ФСТЭК

enabled an automatic merge when the pipeline for 11b88149 succeeds

merged