Remove some unused #[derive] (#473)

We used to need them, probably when we were using Tera.

plume-models/src/blogs.rs

@@ -1,4 +1,4 @@
-use activitypub::{actor::Group, collection::OrderedCollection, Actor, CustomObject, Object};
+use activitypub::{actor::Group, collection::OrderedCollection, CustomObject};
 use chrono::NaiveDateTime;
 use diesel::{self, ExpressionMethods, QueryDsl, RunQueryDsl, SaveChangesDsl};
 use openssl::{
@@ -30,7 +30,7 @@ use {Connection, BASE_URL, USE_HTTPS, Error, Result};
 
 pub type CustomGroup = CustomObject<ApSignature, Group>;
 
-#[derive(Queryable, Identifiable, Serialize, Deserialize, Clone, AsChangeset)]
+#[derive(Queryable, Identifiable, Clone, AsChangeset)]
 pub struct Blog {
     pub id: i32,
     pub actor_id: String,
@@ -363,9 +363,6 @@ impl IntoId for Blog {
     }
 }
 
-impl Object for Blog {}
-impl Actor for Blog {}
-
 impl WithInbox for Blog {
     fn get_inbox_url(&self) -> String {
         self.inbox_url.clone()