Review and improve processes described in Play online.

If I click on Codespaces button in github repo the code space fails.

If I click on the badge in the README.md it works.

I suspect the issue is that we removed the default devcontainer.json file which was the same as /base_with_nuxt_naked.

Helpful command:
Use Cmd/Ctrl + Shift + P -> View Creation Log to see full logs