docs: Document Thanos Sharding

[bwplotka]

As done in proposal: #1501

AC:

• Thanos time and block sharding should be documented.

[VarunVats9]

@bwplotka : I don't have any experience on thanos, would you suggest, if I should take up this task ?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[bwplotka]

We need that still! @daixiang0 any update?

[daixiang0]

I would update it in few days.

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This issue/PR has been automatically marked as stale because it has not had recent activity. Please comment on status otherwise the issue will be closed in a week. Thank you for your contributions.

[bwplotka]

Almost there (:

…

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