Fixed issue with manifest.json route

• Fixed:
- issue with manifest.json route, now returning hardcoded json successfully

app/presenters/instance_presenter.rb

@@ -9,26 +9,6 @@ class InstancePresenter
     to: Setting
   )
 
-  def contact_account
-    Account.find_local(Setting.site_contact_username.strip.gsub(/\A@/, ''))
-  end
-
-  def user_count
-    Rails.cache.fetch('user_count') { User.confirmed.joins(:account).merge(Account.without_suspended).count }
-  end
-
-  def active_user_count
-    Rails.cache.fetch('active_user_count') { Redis.current.pfcount(*(0..3).map { |i| "activity:logins:#{i.weeks.ago.utc.to_date.cweek}" }) }
-  end
-
-  def status_count
-    Rails.cache.fetch('local_status_count') { Account.local.joins(:account_stat).sum('account_stats.statuses_count') }.to_i
-  end
-
-  def domain_count
-    Rails.cache.fetch('distinct_domain_count') { Account.distinct.count(:domain) }
-  end
-
   def sample_accounts
     Rails.cache.fetch('sample_accounts', expires_in: 12.hours) { Account.discoverable.popular.limit(3) }
   end