Improve anti_followbot_policy.ex
I'll prob do this myself sooner or later, but I'm unsure when so I'm adding it as an issue
- anti_followbot_policy.ex doesn't check if an account is marked as a bot. If it is, it should obviously be detected as a bot
- An idea that came up is to have #yesbot instead of #nobot[1]. This could be implemented through this policy. If a request turns out to be a bot => drop it unless the target has #yesbot in their profile