add the practitioner nav to the dot net docs

[susanev]

overview

weve got a new practitioner nav that is intended to be used on the non-marketing specific experiences to help give context and easy access to other tools. lets add it to the dot net docs

design details

• [ ] add the practitioner nav to the docs at https://www.pulumi.com/docs/reference/pkg/dotnet/Pulumi/Pulumi.html

screenshot