Fix getting started docs for windows users

[JurrianFahner]

Description

Resolve error for windows users: Access is denied. (os error 5)

It looks like this error is related to windows: https://github.com/trunk-rs/trunk/issues/681

Also trunk serve is added to conclude getting started with starter template

Checklist

• [x] I have reviewed my own code
• [x] Formatted the docs with prettier
• [ ] I have added tests