remove links to dotnet-migrate

Author: meaghanlewis

docs/core/tools/dotnet.md

@@ -170,7 +170,6 @@ The following options are available only when `dotnet` runs an application by us
 | [dotnet clean](dotnet-clean.md)                    | Clean build outputs.                                                |
 | [dotnet exec](#options-for-running-an-application) | Runs a .NET application.                                            |
 | [dotnet help](dotnet-help.md)                      | Shows more detailed documentation online for the command.           |
-| [dotnet migrate](dotnet-migrate.md)                | Migrates a valid Preview 2 project to a .NET Core SDK 1.0 project.  |
 | [dotnet msbuild](dotnet-msbuild.md)                | Provides access to the MSBuild command line.                        |
 | [dotnet new](dotnet-new.md)                        | Initializes a C# or F# project for a given template.                |
 | [dotnet pack](dotnet-pack.md)                      | Creates a NuGet package of your code.                               |

docs/core/tools/index.md

@@ -64,7 +64,6 @@ The following commands are installed by default:
 - [`test`](dotnet-test.md)
 - [`vstest`](dotnet-vstest.md)
 - [`pack`](dotnet-pack.md)
-- [`migrate`](dotnet-migrate.md)
 - [`clean`](dotnet-clean.md)
 - [`sln`](dotnet-sln.md)
 - [`help`](dotnet-help.md)