Removed sheriff-o-matic and perf-status docs as there is agreement against using them. Clarified bug queues.
Removed sheriff-o-matic and perf-status docs as there is agreement against using them. Clarified bug queues.

Review URL: https://codereview.chromium.org/1519933003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#365112}

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