Update to include all Serverless integrations, including Cloud Native projects

[angellk]

The current Serverless page does not include all offerings or projects that integrate with Dapr, please update

xref: https://github.com/cncf/toc/issues/1354

[msfussell]

self assigned. This need to include the following

• Azure Functions integration - https://docs.dapr.io/developing-applications/integrations/azure/azure-functions/
• Knative Functions integration - https://github.com/knative/func
• Diagrid Catalyst - https://docs.diagrid.io/catalyst/