Streamline the usage of styles

[timea-solid]

Currently there are different ways to use styles just in solid-ui
Findings after code analysis:

* all files which make use of ui style.js: infinite, message, messageTools, thread, buttons, forms, multiSelect, autocompleteField, autocompletePicker, buttons
* all files which make use of jss:acl-control, headerFooterhelpers, buttons
* all files which make use of ns.ui: participation, preferences, login, fields.stories, form.stories, options.stories, label, forms, basic, comment, fieldParams, formStyle, autocompleteField
* all files which have own styles: media, signup, dragAndDrop, error, forms, pad, participation, tabs

[timea-solid]

In the SolidOS meeting from 15.03.2023 we have decided to go towards using only style.js throughout solid-ui and possibly leaving ns.ui only in the RDF forms part of the code and forms themselves.

[timea-solid]

• JSS was refactored out ✅