README: Remove broken link to infra/op-replica

[ajsutton]

Description

Remove broken link to infra/op-replica in the README. op-replica was removed in 23150b8

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Latest commit: 15bfe06

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[tynes]

Good catch

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

This PR is next in line to be merged, and will be merged as soon as checks pass.