[Suggestion] Export manpages for exported apps / bins

**Is your feature request related to a problem? Please describe.**
I like checking manpages for used programs/applications. It's really great that I can export apps and bins, so I can use them in any other distrobox container or the host itself. I couldn't find a way to get the manpages in the same way.

**Describe the solution you'd like**
I see two possible options:
a) when a manpage for an exported bin is available, create a link or copy in ~/.local/share/man
b) add a separate export option for manpages with target folder in the profile

**Describe alternatives you've considered**
I thought about adjusting the manpage path, but I have no idea how I can mount a container directory in my homedirectory that it is accessible from host or other distroboxes.

Look at how distrobox exports binaries (likely in scripts or commands handling export). Check if manpages exist in the container for exported apps. The solution involves modifying export logic to also handle manpages, possibly by linking or copying them to a host directory like ~/.local/share/man. Start by examining the export command implementation and testing with a simple container app that has a manpage.

Scritto dal modello di indicizzazione a partire dal testo della issue.