include more info on editors

[tkimnguyen]

from https://testthedocs.org/training/basic/tools/editors.html in https://github.com/plone/documentation/blob/5.0/about/helper_tools.rst (also the Docker for it)

[svx]

@tkimnguyen Here we go, not finished, yet but hopefully it will be soon.

Still, not sure yet what is better, putting it into a blog post or as part of docs.testthedocs.org