Work CI-CD

- Update build badge.
- Remove preview mention.

***NO_CI***

Author: josesimoes

README.md

@@ -11,11 +11,8 @@
 | Component | Build Status | NuGet Package |
 |:-|---|---|
 | System.Net.Http | [![Build Status](https://dev.azure.com/nanoframework/System.Net.Http/_apis/build/status/System.Net.Http?repoName=nanoframework%2FSystem.Net.Http&branchName=main)](https://dev.azure.com/nanoframework/System.Net.Http/_build/latest?definitionId=12&repoName=nanoframework%2FSystem.Net.Http&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.System.Net.Http.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net.Http/) |
-| System.Net.Http (preview) | [![Build Status](https://dev.azure.com/nanoframework/System.Net.Http/_apis/build/status/System.Net.Http?repoName=nanoframework%2FSystem.Net.Http&branchName=develop)](https://dev.azure.com/nanoframework/System.Net.Http/_build/latest?definitionId=12&repoName=nanoframework%2FSystem.Net.Http&branchName=develop) | [![NuGet](https://img.shields.io/nuget/vpre/nanoFramework.System.Net.Http.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net.Http/) |
 | System.Net.Http.Client | [![Build Status](https://dev.azure.com/nanoframework/System.Net.Http/_apis/build/status/System.Net.Http?repoName=nanoframework%2FSystem.Net.Http&branchName=main)](https://dev.azure.com/nanoframework/System.Net.Http/_build/latest?definitionId=12&repoName=nanoframework%2FSystem.Net.Http&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.System.Net.Http.Client.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net.Http.Client/) |
-| System.Net.Http.Client (preview) | [![Build Status](https://dev.azure.com/nanoframework/System.Net.Http/_apis/build/status/System.Net.Http?repoName=nanoframework%2FSystem.Net.Http&branchName=develop)](https://dev.azure.com/nanoframework/System.Net.Http/_build/latest?definitionId=12&repoName=nanoframework%2FSystem.Net.Http&branchName=develop) | [![NuGet](https://img.shields.io/nuget/vpre/nanoFramework.System.Net.Http.Client.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net.Http.Client/) |
 | System.Net.Http.Server | [![Build Status](https://dev.azure.com/nanoframework/System.Net.Http/_apis/build/status/System.Net.Http?repoName=nanoframework%2FSystem.Net.Http&branchName=main)](https://dev.azure.com/nanoframework/System.Net.Http/_build/latest?definitionId=12&repoName=nanoframework%2FSystem.Net.Http&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.System.Net.Http.Server.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net.Http.Server/) |
-| System.Net.Http.Server (preview) | [![Build Status](https://dev.azure.com/nanoframework/System.Net.Http/_apis/build/status/System.Net.Http?repoName=nanoframework%2FSystem.Net.Http&branchName=develop)](https://dev.azure.com/nanoframework/System.Net.Http/_build/latest?definitionId=12&repoName=nanoframework%2FSystem.Net.Http&branchName=develop) | [![NuGet](https://img.shields.io/nuget/vpre/nanoFramework.System.Net.Http.Server.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net.Http.Server/) |
 
 ## Usage examples