[Dev setup] Developer Setup

[titimoby]

I don't know it's the case for all OSes.
I'm using Ubuntu 18.04

According to the Readthedocs page:
https://mu.readthedocs.io/en/latest/website.html

all you need is git clone then jekyll serve
On my system, I first need to run bundle install then use bundle exec jekyll serve (to avoid issue with public_suffix versions conflict)