feat(cli): fzf CTRL-T preview config

Author: nandalopes

root/private_dot_config/fzf/fzf.sh.tmpl

@@ -47,6 +47,7 @@ export FZF_CTRL_T_COMMAND=
 \\) \
 -print 2> /dev/null | cut -b3-"
   {{- end }}
+export FZF_CTRL_T_OPTS='--preview "cat {} | head -$FZF_PREVIEW_LINES" --bind "?:toggle-preview"'
 
 
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