Migration project from `npm` to `pnpm`

It is recommended to migrate the project from `npm` to `pnpm` because of the benefits it provides as listed [here](https://pnpm.io/pnpm-vs-npm)

[Migrating from NPM to PNPM](https://britishgeologicalsurvey.github.io/development/migrating-from-npm-to-pnpm/) would be a good tutorial on how to do this