feat: add folding config

[vicmattos]

No description provided.

[upsetbit]

thanks @vicmattos!

I can accept your PR provided that (1) you update the usage/options section and (2) add some sort of test

if you can't, that's fine; I'll do it in the not-so-near future, when I can

[MrModest]

I believe for the test, you can add something like this:

# test `--no-folding`
figlet "folding"
run_playbook "absent" # clean the directory
run_playbook "present" "no" "yes"

# test if the directories were actually created and not symlinked
test -d "$HOME/.config" || exit 1
test -d "$HOME/.config/foo" || exit 1
test -L "$HOME/.config/foo/bar" || exit 1

assuming that the run_playbook function accepts a 3rd "no-folding" flag and if it's yes then adds the --no-folding flag

reference for the test: https://unix.stackexchange.com/questions/96907/how-do-i-check-if-a-file-is-a-symbolic-link-to-a-directory