feat: improve autojump

[psicho2000]

In case of z.lua with fzf, the experience can be improved: currently, we need to potentially input twice. First for the initial query, second for filtering. We can improve this in two ways:

1. Delegate the selection process completely to fzf: pipe all dirs into fzf and let it select the entry after the last slash
2. Remove the weightings - they are not needed while selecting.

[jarun]

Thank you!