Clean up GA hashing script/runbook

[arsalansufi]

https://docs.google.com/document/d/11EEgMBJ7C7fKaKjYD2RoWTSZwIdmZdE4gBtrGNzptFk/edit?usp=sharing

[jonahkagan]

@arsalansufi what needs cleaning up?

[arsalansufi]

I'll own this @jonahkagan! At the bare minimum, I need to update this doc and the corresponding branch to reference the new audit ID and election date, e.g., 6e5546a

Though ideally, I'm going to make some other improvements to make this more foolproof

[arsalansufi]

Did the bare minimum of updating the audit ID and ZIP file name in the script: 9d9ab7b

And updated the runbook: https://docs.google.com/document/d/11EEgMBJ7C7fKaKjYD2RoWTSZwIdmZdE4gBtrGNzptFk/edit?usp=sharing