Following the Parcel v1 installation guide seems to install the latest version of Parcel (v2), which makes several instructions in this guide throw errors. Therefore, I have updated the guide to work with version 2 of Parcel.
Change Details:
1) Update the URL to point to the latest doc pages.
2) Use the `type="module"` HTML attribute to reference a module [migration](https://parceljs.org/getting-started/migration/#code-changes)
3) The `--out-dir <dir>` CLI parameter has been changed to `--dist-dir <dir>` [CLI](https://parceljs.org/features/cli/#parameters)
4) For a reason I'm unsure of, `--experimental-scope-hoisting` throws the following error: `error: unknown option '--experimental-scope-hoisting'`, so I removed it to get the build to work.
