[ADD] Fuzzy file finder for Vim, Bash, Zsh

Mappings for vcs files, all files, buffers, buffer history, and tags
have been added to the Vim configuration.

The installation process automatically adds the fzf sourcing commands to
both Bash and Zsh configuration files.

zsh/.zshrc

@@ -104,3 +104,5 @@ if [[ $TERM == xterm-termite ]]; then
   . /etc/profile.d/vte.sh
   __vte_osc7
 fi
+
+[ -f ~/.fzf.zsh ] && source ~/.fzf.zsh