Forbid
[deprecated](https://drafts.csswg.org/css-text-3/#word-break-property)
`break-word` and fix all occurences.
Regarding `overflow-wrap: break-word` vs `overflow-wrap: anywhere`:
Example of difference: https://jsfiddle.net/silverwind/1va6972r/
[Here](https://stackoverflow.com/questions/77651244) it says:
> The differences between normal, break-word and anywhere are only clear
if you are using width: min-content on the element containing the text,
and you also set a max-width. A pretty rare scenario.
I don't think this difference will make any practical impact as we are
not hitting this rare scenario.
Add
[`stylelint-value-no-unknown-custom-properties`](https://github.com/csstools/stylelint-value-no-unknown-custom-properties)
which lints for undefined CSS variables. No current violations.
To make it work properly with editor integrations, I had to convert the
config to JS to be able to pass absolute paths to the plugin, but this
is a needed change anyways.
