Work CI-CD

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

***NO_CI***

CODE_OF_CONDUCT.md

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-# Contributor Code of Conduct
-
-Please refer to the contributor Code of Conduct at the Home repository [here](https://github.com/nanoframework/Home/blob/main/CODE_OF_CONDUCT.md.

CONTRIBUTING.md

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-# 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

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 | Component | Build Status | NuGet Package |
 |:-|---|---|
-| System.Text.RegularExpressions | [![Build Status](https://dev.azure.com/nanoframework/System.Text.RegularExpressions/_apis/build/status/System.Text.RegularExpressions?repoName=nanoframework%2FSystem.Text.RegularExpressions&branchName=main)](https://dev.azure.com/nanoframework/System.Text.RegularExpressions/_build/latest?definitionId=69&repoName=nanoframework%2FSystem.Text.RegularExpressions&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.System.Text.RegularExpressions.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Text.RegularExpressions/)  |
-| System.Text.RegularExpressions (preview) | [![Build Status](https://dev.azure.com/nanoframework/System.Text.RegularExpressions/_apis/build/status/System.Text.RegularExpressions?repoName=nanoframework%2FSystem.Text.RegularExpressions&branchName=develop)](https://dev.azure.com/nanoframework/System.Text.RegularExpressions/_build/latest?definitionId=69&repoName=nanoframework%2FSystem.Text.RegularExpressions&branchName=develop) | [![NuGet](https://img.shields.io/nuget/vpre/nanoFramework.System.Text.RegularExpressions.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Text.RegularExpressions/) |
+| System.Text.RegularExpressions | [![Build Status](https://dev.azure.com/nanoframework/System.Text.RegularExpressions/_apis/build/status/System.Text.RegularExpressions?repoName=nanoframework%2FSystem.Text.RegularExpressions&branchName=main)](https://dev.azure.com/nanoframework/System.Text.RegularExpressions/_build/latest?definitionId=69&repoName=nanoframework%2FSystem.Text.RegularExpressions&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.System.Text.RegularExpressions.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Text.RegularExpressions/) |
 
 **Important**: This Regular Expressions parser will cover most of your needs. It has some limitation when the pattern is complex and not a full compatibility. This is an on going work, mainly built on the .NET Microframework implementation. Please do not hesitate to raise any issue if any issue. Also, any help to improve this parser it's more than welcome.