Redirect to dotnet.microsoft.com works not on subpages

[Andreas Willich]

The redirect to https://dotnet.microsoft.com doesn't work on the subpages.

Pages like https://dotnet.github.io/dotnet-web/ are still available.

Problematic is, that Google has some pages in the top result:

Link: https://dotnet.github.io/dotnet-web/docs/porting/supporting-core.html