Replace wrong name for nvm

[Bernstein7z]

I assume the second npm should be nvm.

pawelgrzybek.com/content/posts/2023-12-01-i-replaced-npm-yarn-and-nvm-with-pnpm/index.md

Line 8 in 2fa7539

I replaced `npm`, `yarn` and `npm` with `pnpm`. It stands for a "performant npm", which is not a stretch because it is much faster than any other package manager I used. Besides that, it has many great features like workspace support, patching dependencies, managing runtime versions, peer installation and tons more! Look at the few examples of commands from my old workflow and how I mapped them to a new one.

[pawelgrzybek]

You are an absolute hero and a good example of how to contribute to open source! Not many people took the effort to correct some spelling mistakes on the blog via GitHub issues. I really appreciate your help.