[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.