message: Remove `copy-file` from Markdown view
diff: @@ -42,7 +42,7 @@ function removeButton(): void {
  function init(): void {
  delegate('.rgh-copy-file', 'click', handleClick);
  - if (select.exists('.blob.instapaper_body')) {
  + if (select.exists('.blob > .markdown-body')) {
  delegate('.rgh-md-source', 'rgh:view-markdown-source', renderButton);
  delegate('.rgh-md-source', 'rgh:view-markdown-rendered', removeButton);
  } else {
  