Add fuzzy finder

Add fzf as submodule.
Source it keybindings and completion files.
Adjust dotbot install config to pull fzf binary.
Add symlink to its binary.

.config/zsh/.zshrc

@@ -131,6 +131,7 @@ comp-source "$ZSH_CONF/transfer.zsh"
 comp-source "$ZSH_CONF/zsh-autosuggestions/zsh-autosuggestions.zsh"
 comp-source "$ZSH_CONF/completion.zsh"
 # comp-source "$ZSH_CONF/zsh-async/async.zsh"
+comp-source "$ZSH_CONF/fzf/shell/completion.zsh"
 #     async_init
 ### syntax-highlight > history-substring > keys
 # syntax highlighting