nb923

Add one-liner info about components of KubeFlow to docs

2

**Checklist:** - [x] You have [signed off your commits](https://www.kubeflow.org/docs/about/contributing/#sign-off-your-commits) - [x] Ensure you follow best practices from our guide. [Contributing](https://github.com/kubeflow/website/blob/master/content/en/docs/about/contributing.md). - [x] You have included screenshots when changing the website...