ViewComponent/view_component v4.0.0.rc5 on GitHub

Revert change setting #format. In GitHub's codebase, the change led to hard-to-detect failures. For example, components rendered from controllers included layouts when they didn't before. In other cases, the response content_type changed, breaking downstream consumers. For cases where a specific content type is needed, use:
```
respond_to do |f|
  f.html_fragment do
    render(MyComponent.new)
  end
end
```
Joel Hawksley