docs.kernel.org convenience URL

[Konstantin Ryabitsev <konstantin@xxxxxxxxxxxxxxxxxxx>]

Hi, all:

I set up a convenience URL for kernel docs:

  docs.kernel.org

Toplevel redirects to https://www.kernel.org/doc/html/latest/, but you 
can get a specific version as well:

  docs.kernel.org/5.5

You can also do subpaths:

  docs.kernel.org/admin-guide/index.html
  docs.kernel.org/5.5/admin-guide/index.html

-K