message: docs: add link to Yarn in README
  Remove the code markdown. It is not code, it is a name.
  PR Close
diff: @@ -8,7 +8,7 @@ Everything in this folder is part of the documentation project. This includes
  ## Developer tasks
  -We use `yarn` to manage the dependencies and to run build tasks.
  +We use [Yarn](https://yarnpkg.com) to manage the dependencies and to run build tasks.
  You should run all these tasks from the `angular/aio` folder.
  Here are the most important tasks you might need to use:
  