Add fuzzy bash completions

[DannyBen]

This PR adds fuzzy bash completions to the cd command.

1. The new cd -c command outputs a short completions function
2. To install it, simply call eval "$(cd -c)" in the current session, or in ~/.bashrc
3. Type cd some-fuzzy-search<TAB> to see the result.
4. The suggestions are sorted by the same fzf priority.

This is particularly useful when tab completions are configured to instantly complete the line. To do so, add the below lines to ~/.inputrc (create the file if needed).

# ~/.inputrc
# Change tab behavior and add shift tab for old behavior
TAB: menu-complete
"\e[Z": complete