Add a flag to enable NuGet.org README.md display

[pakrym]

Contributes to #21160

[pakrym]

Requires new SDK will wait a bit.

[pakrym]

Couple problems (https://www.nuget.org/packages/Azure.Template/1.0.3-beta.914605#):

1. HTML-style comments are displayed.
2. Common bar display.
   
3. Link labels are not removed
   

[pakrym]

I think we can pre-process the markdown ourselves. But I'll file an issue on Nuget first and see if they are open to making changes in their generation.

[pakrym]

Filed NuGet/NuGetGallery#8627 but also added a pre-process script.

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[pakrym]

Also filed NuGet/NuGetGallery#8632

[weshaggard]

Looks reasonable once folks are OK with moving to the new toolset.

[pakrym]

/azp run net - core - ci

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[pakrym]

/check-enforcer override