Cro-dl

- Add a `--version` support.
- Various small and cosmetic fixes.

- Description of a Series is displayed before download.
- Various fixes in code structure (not importend for an end user)

- Fix crash / premature exit when the series episodes are not available
- Add info on when the episodes were aired originally
- Rename a update some fns
- Fix typos
- Update UV dependencies versions

Various small fixes.

First public version on Github.