In addition to being simpler, it allows subsequent up/down history
or accept-line-and-down-history widgets to work.
Also allow for find being and alias if alias expansion
after command is enabled.
- Use symlinks instead of generating the full content
- Update fish_user_paths and remove ~/.config/fish/functions/fzf.fish
- Create wrapper script for fzf when Ruby version and use it instead of
exported function not to break fzf-tmux
