remove letsencrypt including migration

config/initializers/letsencrypt.rb

@@ -1,15 +0,0 @@
-LetsEncrypt.config do |config|
-  # Using Let's Encrypt staging server or not
-  # Default only `Rails.env.production? == true` will use Let's Encrypt production server.
-  config.use_staging = false
-
-  # Set the private key path
-  # Default is locate at config/letsencrypt.key
-  config.private_key_path = Rails.root.join('config', 'letsencrypt.key')
-
-  # Use environment variable to set private key
-  # If enable, the API Client will use `LETSENCRYPT_PRIVATE_KEY` as private key
-  # Default is false
-  config.use_env_key = false
-
-end