Implement proper ratelimiting

[SapphicCode]

Ratelimit the amount of

• [ ] All actions (by IP)
• [ ] Entry creations (by user)
• [ ] Entry edits (by user)
• [ ] User account creations (by IP)

Note that when I say "by IP", I mean by hashed (likely SHA256'd) IP address, not directly storing the IP.

[SapphicCode]

I'm implementing this for #3, albeit only for that section. Making note to add this to the web app pages too.