Update latest folder with one index.html includes the redirect links (#1298)
Update latest folder with one index.html includes the redirect links (#1298)

We currently do not support one generic link for latest GA version doc.
The PR is to update the index.html to redirect to the latest GA version, if no GA version, then redirect to latest preview. 

The template has been updated.
https://azuresdkdocs.blob.core.windows.net/$web/java/azure-sdk-template/latest/index.html
https://azuresdkdocs.blob.core.windows.net/$web/python/azure-template/latest/index.html
https://azuresdkdocs.blob.core.windows.net/$web/dotnet/Azure.Template/latest/index.html
https://azuresdkdocs.blob.core.windows.net/$web/javascript/azure-template/latest/index.html
tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools