message: docs: reference to github-pr extension
diff: This vscode extension integrates with GitHub.
  +**Note: I recommend to use [GitHub Pull Requests](https://marketplace.visualstudio.com/items?itemName=GitHub.vscode-pull-request-github) instead of this, because most usecases are supported and there is a team at Microsoft/GitHub supporting development**
  +
  ## Features
  Currently it is possible to do the following:
  