feat(spam): Introduce checking new accounts, events & comments for spam with the help of Akismet

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

mix.exs

@@ -208,6 +208,7 @@ defmodule Mobilizon.Mixfile do
       {:vite_phx, "~> 0.2"},
       {:unplug, "~> 1.0.0"},
       {:replug, "~> 0.1.0"},
+      {:exkismet, github: "tcitworld/exkismet"},
       # Dev and test dependencies
       {:phoenix_live_reload, "~> 1.2", only: [:dev, :e2e]},
       {:ex_machina, "~> 2.3", only: [:dev, :test]},