Update README.md

Deploy to Azure points to Main

scenarios/secure-baseline-multitenant/azure-resource-manager/README.md

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 # Multitenant App Service Secure Baseline - ARM Implementation
 You can deploy the current LZA directly in your azure subscription by hitting the button below. 
 
-[![Deploy to Azure](https://aka.ms/deploytoazurebutton)](https://portal.azure.com/#view/Microsoft_Azure_CreateUIDef/CustomDeploymentBlade/uri/https%3A%2F%2Fraw.githubusercontent.com%2Fthotheod%2Fappservice-landing-zone-accelerator%2Fmain%2Fscenarios%2Fsecure-baseline-multitenant%2Fazure-resource-manager%2Fmain.json/uiFormDefinitionUri/https%3A%2F%2Fraw.githubusercontent.com%2Fthotheod%2Fappservice-landing-zone-accelerator%2Fmain%2Fscenarios%2Fsecure-baseline-multitenant%2Fazure-resource-manager%2Fmain-portal-ux.json)
+[![Deploy to Azure](https://aka.ms/deploytoazurebutton)](https://portal.azure.com/#view/Microsoft_Azure_CreateUIDef/CustomDeploymentBlade/uri/https%3A%2F%2Fraw.githubusercontent.com%2Fazure%2Fappservice-landing-zone-accelerator%2Fmain%2Fscenarios%2Fsecure-baseline-multitenant%2Fazure-resource-manager%2Fmain.json/uiFormDefinitionUri/https%3A%2F%2Fraw.githubusercontent.com%2Fazure%2Fappservice-landing-zone-accelerator%2Fmain%2Fscenarios%2Fsecure-baseline-multitenant%2Fazure-resource-manager%2Fmain-portal-ux.json)
 
 
 Alternatively, you can clone the repo and follow the instractions below