Due to changes in the directory structure of the `doc/images` folder, the link for `examples_settings.png` was broken and image was not showing up. I have fixed the link and image is showing up in the README.md file.
Microsoft changed the name of Fabric UI to Fluent UI. Updated title and URL (which still links to the same page, just with a direct link instead of a redirect).
* docs: split usage and dev docs
* # This is a combination of 2 commits.
# This is the 1st commit message:
docs: split usage and dev docs
# The commit message #2 will be skipped:
# fixup add docs
* docs: add runner documentation and move hooks documentation to devdocs
* docs: add stubs for modules technical description
* docs: add paragraph about event thread-safety
* docs: add 'Current modules' section header
