Remove pnpm by NicoVIII, it was moved to devcontainers-contrib

[NicoVIII]

Like discussed here, the pnpm feature was moved into devcontainers-contrib:
https://github.com/devcontainers-contrib/features/issues/265

The old entry can be removed from the index to avoid the duplicate listing of pnpm. The one in devcontainers-contrib should be used from now on.

[eitsupi]

The old entry can be removed from the index to avoid the duplicate listing of pnpm. The one in devcontainers-contrib should be used from now on.

@NicoVIII Did you check the process how to deprecate Features?
https://github.com/devcontainers/spec/blob/cd07f1584acd44ca84c7841fdc5548754c78f381/proposals/features-legacyIds-deprecated-properties.md

This procedure can be used to notify users that a Feature has been deprecated.

[NicoVIII]

Not yet, I first wanted to make sure nobody chooses it in the creation dialog from now on.

Thanks for the link, I will check it out shortly :)

[samruddhikhandale]

Thanks @eitsupi for pointing to the doc.

@NicoVIII If you deprecate the Feature, then it will stop getting listed by the supporting tools. Also, it will update the README and in future we will be adding VS Code hints to notify the user.

[samruddhikhandale]

As you only have a single Feature, removing it from the index definitely works for you. However, if you had multiple Features in the same repo then using the deprecated flag was a better approach.