Update start-simple.md

[axlehner]

I did not like the enumeration, let's do bullet points instead! (sorry, I did not find anything else)

[luizaandrade]

Hehe, that's fair, you'd already reviewed this. You can also link this PR to the issue that is solves and the issue will be automatically closed when the PR is merged to master by writing something like "resolves #31".

Here's the documentation for it: https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue

Anyway, this is approved. Please merge the PR and delete the branch once you've done so.