docs: add details about dev env setup

[chipsTM]

Proposed changes

Add more clarity to the Contributing docs about the development environment to allow contributors to get started more easily

Types of changes

What types of changes does your code introduce to Scuffle?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

If this is a relatively large or complex change, you may want to start the discussion by explaining why you chose the solution you did, what alternatives you considered, etc.

[CLAassistant]

All committers have signed the CLA.

[lennartkloock]

We try to avoid using npm. Instead use pnpm.

[TroyKomodo]

perhaps include the commands to generate these?