Improve DDOS internal documentation

[mekarpeles]

Proposal

Add description of process + tips for filtering logs and identifying bad actors and document in our ddos guide

https://github.com/internetarchive/openlibrary/wiki/Disaster-Recovery-&-Immediate-Response#handling-abuse--ddos-denial-of-service-attack (also, consider making private in olsystem if we add identifying info on attacks)

Justification

Breakdown

Requirements Checklist

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[mekarpeles]

@scottbarnes do you mind trying whatever docs + scripts @cdrini comes up with and make sure the docs are clear?