WSL students will need `unzip` to use the wagon templates

[Nikos Agathos]

unzip stylesheets.zip -d app/assets && rm stylesheets.zip && mv app/assets/rails-stylesheets-master app/assets/stylesheets

Ubuntu in WSL doesn't include unzip 🤷‍♂️ So they won't be able to run this line of the template script

Might as well add it in the setup?