Chore: Switch from Carrierwave to ActiveStorage (#393)

config/initializers/carrierwave.rb

@@ -1,37 +0,0 @@
-CarrierWave.configure do |config|
-  config.storage = :file
-end
-
-if Rails.env.production?
-  CarrierWave.configure do |config|
-    config.storage    = :aws
-    config.aws_bucket = ENV['S3_BUCKET_NAME']
-    config.aws_acl    = 'authenticated-read'
-
-    # Optionally define an asset host for configurations that are fronted by a
-    # content host, such as CloudFront.
-    # config.asset_host = 'http://example.com'
-
-    # The maximum period for authenticated_urls is only 7 days.
-    config.aws_authenticated_url_expiration = 60 * 60 * 24 * 7
-
-    # Set custom options such as cache control to leverage browser caching
-    config.aws_attributes = {
-      expires: 1.week.from_now.httpdate,
-      cache_control: 'max-age=604800'
-    }
-
-    config.aws_credentials = {
-      access_key_id: ENV['AWS_ACCESS_KEY_ID'],
-      secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
-      region: ENV['AWS_REGION'] # Required
-    }
-
-    # Optional: Signing of download urls, e.g. for serving private content through
-    # CloudFront. Be sure you have the `cloudfront-signer` gem installed and
-    # configured:
-    # config.aws_signer = -> (unsigned_url, options) do
-    #   Aws::CF::Signer.sign_url(unsigned_url, options)
-    # end
-  end
-end