Remove Cloudflare "I'm under attack" page rules on `/users/sign_in`
We have a customer having trouble as a result of the rules we added to Cloudflare in production#2139 (closed).
Let's remove this rule in favor of other protections.
Slack conversation: https://gitlab.slack.com/archives/CB3LSMEJV/p1589555877377600 (link expires 2020-08-12)
Edited by Antony Saba