feat(notif): add Pushbullet and Pushover agents to user notification settings (#1740)

* feat(notif): add Pushbullet and Pushover agents to user notification settings

* docs(notif): add "hint" about user notifications to Pushbullet and Pushover pages

* fix: regenerate DB migration

server/entity/UserSettings.ts

@@ -42,6 +42,15 @@ export class UserSettings {
   @Column({ nullable: true })
   public discordId?: string;
 
+  @Column({ nullable: true })
+  public pushbulletAccessToken?: string;
+
+  @Column({ nullable: true })
+  public pushoverApplicationToken?: string;
+
+  @Column({ nullable: true })
+  public pushoverUserKey?: string;
+
   @Column({ nullable: true })
   public telegramChatId?: string;