Remove unused logger

config/app.rb

@@ -1,12 +1,11 @@
 # frozen_string_literal: true
 
-require 'logger'
 require 'pathname'
 
 # Encapsulates app configuration
 module App
   class << self
-    attr_reader :logger, :version, :released_at
+    attr_reader :version, :released_at
 
     def env
       ENV['RACK_ENV'] || 'development'
@@ -17,7 +16,6 @@ module App
     end
   end
 
-  @logger = Logger.new(STDOUT)
   @version = `git rev-parse --short HEAD 2>/dev/null`.strip!
   @released_at = `git show -s --format=%ci HEAD`
 end