* feat(icons): add nonicons.nvim icon provider support
Problem: oil.nvim only recognizes mini.icons and nvim-web-devicons as
icon providers. nonicons.nvim works when paired with devicons (via its
apply() monkey-patch), but has no standalone support.
Solution: add a nonicons.nvim fallback in get_icon_provider(), placed
after devicons so the patched devicons path is preferred when both are
installed. The standalone path handles directories via
nonicons.get('file-directory'), files via filetype/extension lookup with
a generic file icon fallback.
* fix(doc): improve readme phrasing
07ae3a8dc3