Created by: jeblad
Mostly just linting and spellchecking, but also rephrased a few places. Some URLs are made relative, to facilitate testing at other sites (ie. https://jeblad.github.io/Solaar/).
The cleanup is done in VScode, with LanguageTool, Spell Right, and markdownlint. I have not added the dict-files, if necessary that can be done.