Update Nuxeo boilerplate in READMEs

Nuxeo provides a [Hyperscale Digital Asset Platform](https://www.nuxeo.com/products/content-management-platform/) that helps enterprise organizations unlock the full value of their digital assets to grow revenue, improve performance, and maximize investments. Leading organizations use Nuxeo for [digital asset management](https://www.nuxeo.com/solutions/digital-asset-management/), [document management](https://www.nuxeo.com/solutions/document-management/), [knowledge management](https://www.nuxeo.com/solutions/advanced-knowledge-base/), and other content-centric business applications.