Adding Rack::Attack for DDoS defense

[kstack7]

I've noticed some DDoS attempts on the GDI website in the form of wp-login spamming. We currently and successfully redirect all the requests, but the ongoing attempts can slow down the site. Rack Attack will ban IPs that spam the website for ~5 min if attempted more than 3 times. I'll be monitoring to see if this is enough time or if we should up the ban length. 👍

[DBNess]

🤗 @kstack7, you rule

[kstack7]

@DBNess ❤️