Sample blueprints should be reorganized

[azsec]

There are things here that should be reorganized https://github.com/Azure/azure-blueprints/tree/master/samples/001-builtins

As far as my understanding (after digging into Az.Blueprint PowerShell code base), the Import Artifact really recursively read into artifacts folder. I'd recommend to reorganize to make it more clear to read.

I've written a bit about deploying ASC through Azure Blueprint https://azsec.azurewebsites.net/2019/12/30/deploy-azure-security-center-blueprint/ and shared template here https://github.com/azsec/azure-blueprints/tree/master/AzureSecurityCenter

Thanks for your effort making a stable Azure Blueprint @alex-frankel