documentation\readme update

App: https://github.com/IBM/hello-carbon-vue3/tree/main/apps/hello-carbon11-vue3

Hi!

Instructions in https://github.com/IBM/hello-carbon-vue3/blob/main/apps/hello-carbon11-vue3/README.md#project-setup should be updated considering this is in a monorepo now.

EG. the `npm run` scripts won't pull from `hello-carbon-vue3/apps/hello-carbon11-vue3` but `hello-carbon-vue3/.`

Thanks!


