npm warns about pnpm-only .npmrc settings in generated scaffolds

[Vheissu]

Summary

Generated Aurelia 2 app/plugin scaffolds include .npmrc with pnpm-only config (shamefully-hoist, auto-install-peers). When users run npm install, npm prints warnings about unknown config keys. This happens for
both app and plugin templates.

Repro

1. Scaffold any project:

npx makes aurelia my-app

2. Run:

npm install

3. Observe warnings:

npm warn Unknown project config "shamefully-hoist".
npm warn Unknown project config "auto-install-peers".

Expected

• No npm warnings in a freshly generated project.

Actual

• npm warns about pnpm-only config keys because .npmrc is always present.

Impact

• First-run experience looks noisy/buggy.
• Users think they misconfigured npm or the scaffold.

Proposed fix

• Remove pnpm-specific settings from the default template.
• Only create .npmrc with pnpm settings when pnpm is explicitly chosen during install.