Earlier, the VSCode settings were only made for installation with
binaries. This expected the path to be "_isaac_sim". As many users
reported, this doesn't work if we have PIP installation of Isaac Sim.

This MR fixes the above issue to ensure a smooth setup of vscode.

Fixes #620, #629

## Type of change

- Bug fix (non-breaking change which fixes an issue)
- This change requires a documentation update

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there