Docs: a few things encountered in the high-throughput tutorial

I ran into a few issues here.

The package on PyPI is fhi-vibes; vibes is something different so pip install vibes[fireworks] gives a misleading error about not recognising the [fireworks] target.
Users might not have poetry so that command also fails.
Pip installing fireworks didn't actually work until I also installed Kerberos header files with dnf install krb5-devel (Fedora). This is not FHI-Vibes's fault, but it might be worth mentioning if it affects users on other platforms too.

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