Org rename: windows-toolkit -> CommunityToolkit

[azchohfi]

Build is failing due to org rename.

PR Type

What kind of change does this PR introduce?

• Bugfix
• Build or CI related changes

What is the current behavior?

Broken build.

What is the new behavior?

The Build builds 🐱‍💻

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Pull Request has been submitted to the documentation repository instructions. Link:
• Sample in sample app has been added / updated (for bug fixes / features)
  • Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• New major technical changes in the toolkit have or will be added to the Wiki e.g. build changes, source generators, testing infrastructure, sample creation changes, etc...
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Header has been added to all new source files (run build/UpdateHeaders.bat)
• Contains NO breaking changes