pmemkv manpages does not have links to other manpages

[Łukasz Stolarczuk]

On the pmemkv's manpage, there are no links to other manpages available for selected release. It should be done using layouts/shortcodes/manpages.html script available in the repository. This script perhaps requires some modifications to work properly with pmemkv.

Usage example:
{{< manpages >}}
see e.g. here:
https://github.com/pmem/pmem.github.io/blob/main/content/pmdk/manpages/linux/master/libpmem/libpmem.7.md

Other thing to check is missing metadata in pmemkv's manpages - header: "..."
or additional (perhaps redundant) layout: "library".