In spite of there being considerable documentation sometimes in the
config file, we go with CC0 because we don't want the notion of
'derived work' of a config file.
The example `settings.conf` is also CC0. Add some docs to
it while we're at it.
- To avoid name-collisions in otherwise well-behaved
modules and configurations, make the QML settings
more specific:
search -> qmlSearch
filename -> qmlFilename