feat: improve contributing documentation as well as maybe use ddev

[hanoii]

I personally use ddev a lot, in particular on PHP projects. I spin one up for this project but git ignore it locally. If you'd considering adding to the repo (and potentially use it) I don't mind setting something up that could be useful for all.

[hanoii]

If curious, this is currently my current ddev setup.

https://github.com/hanoii/siteone-crawler-ddev

If you wish to try it:

• https://docs.ddev.com/en/stable/users/install/ddev-installation/
• ddev start
  (if all good)
• ddev ahoy crawler --url=....