Pod::Find missing on recent Ubuntu 23.10

[dginev]

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Installed Ubuntu 23.10 today and noticed that make test fails due to Pod::Find not being installed.

According to a quick apt-file search Pod/Find.pm that file is available through the apt package libpod-parser-perl. Installing it indeed gets the tests to pass.

I suggest we should add that to the get page, specifically the "only prerequisites" section of "Debian-based systems".

Aside: I also got a little confused while checking if the package was already mentioned - it appears that our official Manual page does not have a link back to the get page, and does not have installation information - which was a bit disorienting. Maybe we could add an Installation section before the "Using" section?