…zche

While I do think all bots enjoy Nietzche (who doesn't?), I think we should
take a stance to educate them. What better way than to be able to choose
from any book!

Personal suggestions include:

- The Sorrows of Young Werther by Goethe
- Any political manifesto
- The Declaration of Independence

etc. etc.

This removes globals from `heffalumpt/`, which are hard to reason about,
easy to get wrong, and should not be created if they are never used.

A possible drawbacks is if you would create multiple new defaults,
but this should never be the case.

This prints the short variants (like `-c` for `--config`)
in the help.

Also fixes bug where only `-h` flag works, not `--help`.