Major Info manual update

This commit integrates most of the config/setup content from the
`README.md` file into the Info manual and adds some more additional
content.
Major overhaul of `README.md` removing config instructions

As the content has been moved to the Info manual (see 25d61a7) the
information contained in `README.md` is now redundant. Now `README.md`
simply refers to the latest Info manual HTML snapshot (which has been
updated as well via 1753d49939).