New linter error if a manual pages website different than manned.org is used in "More information"

[vitorhcl]

My suggestion is to add a list of warned websites, such as linux.org, man7.org and die.net, etc.

Obviously, it isn't a good idea to only allow manned.org links because that would generate a lot of unnecessary false positives when an alternative URL is used such as URLs for the official documentation.

Inspired by tldr-pages/tldr#12907

[spageektti]

This is a good idea.
There are some websites on which man pages are available:

• man7.org
• linux.org
• die.net
• man.page
• mankier.com
• manpage.io
• manpages.org
• man.he.net

[sebastiaanspeck]

This is a good idea.

There are some websites on which man pages are available:

• man7.org

• linux.org

• die.net

• man.page

• mankier.com

• manpage.io

• manpages.org

• man.he.net

manpages.debian.org is another one. The linter should take subdomains into account as well

[sebastiaanspeck]

I would also allow github.com and other Git-hosting sites. I don’t really know if this is still something we would want to have.