Make users-guide buildable from within doc/ subdirectory #9179
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Fixes #7977
Before this PR it is only possible to build the user guide
from the root of the repository. An invocation of "make users-guide"
in the "doc/" subdirectory fails. This commit moves the logic for
building the users-guide from the Makefile at the root of the
repository to the file "doc/Makefile".
From the root of the project only the target "users-guide"
remains, all other targets related to building the users-guide
are only available in the "doc/" subdirectory.
Note: This PR builds upon #9178 which fixes an error in the build system for the docs.