Add sponsorships and sponsorship levels to site

Add a section or page for sponsorships we have and include logos/links to the foundation sites.

Organization | Sponsorship Type

Cloud Foundry Foundation | Silver Member
https://www.cloudfoundry.org

Cloud Native Computing Foundation | Silver Member
https://www.cncf.io

OpenStack Foundation | Member
https://www.openstack.org

Apache Software Foundation | Platinum Member
https://www.apache.org

Linux Foundation | Silver Member
https://www.linuxfoundation.org

Yocto Project | Member
https://www.yoctoproject.org

OpenChain Foundation | Member
https://www.openchainproject.org

ToDoGroup | Member
https://todogroup.org

RDK | Preferred Member
https://rdkcentral.com