✂️ Split GraphQL schema into several files

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

lib/mobilizon_web/schema/events/category.ex

@@ -0,0 +1,11 @@
+defmodule MobilizonWeb.Schema.Events.CategoryType do
+  use Absinthe.Schema.Notation
+
+  @desc "A category"
+  object :category do
+    field(:id, :id, description: "The category's ID")
+    field(:description, :string, description: "The category's description")
+    field(:picture, :picture, description: "The category's picture")
+    field(:title, :string, description: "The category's title")
+  end
+end