Duplicate links on "get started" page

[SomeoneElseOSM]

https://github.com/dotnet-presentations/blazor-workshop/blob/master/docs/00-get-started.md

Currently has these links on it: https://aka.ms/blazor-getting-started https://docs.microsoft.com/aspnet/core/tutorials/build-your-first-blazor-app

As of now, these both redirect to https://dotnet.microsoft.com/learn/aspnet/blazor-tutorial/intro

so there's no point in having both links. Suggested text:

To get started with Blazor, follow the instructions on https://aka.ms/blazor-getting-started and build your first app.