Work CI-CD

- Update build badge.
- Remove preview mention.
- Remove repo files.

***NO_CI***

CODE_OF_CONDUCT.md

@@ -1,3 +0,0 @@
-# Contributor Code of Conduct
-
-Please refer to the contributor Code of Conduct at the Home repository [here](https://github.com/nanoframework/Home/blob/master/CODE_OF_CONDUCT.md.

CONTRIBUTING.md

@@ -1,3 +0,0 @@
-# Contributing to **nanoFramework**
-
-Please refer to the contribution guidelines at the Home repository [here](https://github.com/nanoframework/Home/blob/master/CONTRIBUTING.md).

README.md

@@ -12,7 +12,6 @@
 | Component | Build Status | NuGet Package |
 |:-|---|---|
 | Windows.Devices.SerialCommunication | [![Build Status](https://dev.azure.com/nanoframework/Windows.Devices.SerialCommunication/_apis/build/status/Windows.Devices.SerialCommunication?repoName=nanoframework%2FWindows.Devices.SerialCommunication&branchName=main)](https://dev.azure.com/nanoframework/Windows.Devices.SerialCommunication/_build/latest?definitionId=19&repoName=nanoframework%2FWindows.Devices.SerialCommunication&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.Windows.Devices.SerialCommunication.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.Windows.Devices.SerialCommunication/) |
-| Windows.Devices.SerialCommunication (preview) | [![Build Status](https://dev.azure.com/nanoframework/Windows.Devices.SerialCommunication/_apis/build/status/Windows.Devices.SerialCommunication?repoName=nanoframework%2FWindows.Devices.SerialCommunication&branchName=develop)](https://dev.azure.com/nanoframework/Windows.Devices.SerialCommunication/_build/latest?definitionId=19&repoName=nanoframework%2FWindows.Devices.SerialCommunication&branchName=develop) | [![NuGet](https://img.shields.io/nuget/vpre/nanoFramework.Windows.Devices.SerialCommunication.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.Windows.Devices.SerialCommunication/) |
 
 ## Feedback and documentation