GEODE-9334: Update UG generation scripts

[alb3rtobr]

This PR aligns the user guide generation instructions and scripts with the instructions recently added in Geode (see GEODE-9042).

Uplifts Bookbinder and other gems version, and simplifies the Docker-based scripts to preview the user guides.

[davebarnes97]

LGTM

[moleske]

[alb3rtobr]

CI fails but not due to this PR content.
Clang-format failing saying I should format a file I have not modified. And the "build-windows-2016-vs-2017-debug" failed due to the worker machine has not "tar" installed 😮.

[pdxcodemonkey]

I'm attempting to address CI issues - today is day 2 :/. PR #819 has the formatting fix in it - we updated the version of clang-format to 12 the other day because that's the new default for homebrew on MacOS, and now we have one file already checked into develop that it doesn't like. LGTM is also failing right now because of errors downloading ACE. Please stand by, we'll get it sorted ASAP.

[alb3rtobr]

thanks for the info @pdxcodemonkey . BTW I saw the clang uplift so I installed clang 12. If I run cmake --build . --target all-clangformat there are two files that are modified, but RegionAttributes.cpp is not one of them:

cppcache/include/geode/CacheableString.hpp
cppcache/integration/framework/Cluster.cpp

[pdxcodemonkey]

Still working on that, as well. We're slowly coming to the conclusion that not only is clang-format subtly incompatible between versions, it is also sometimes subtly incompatible in the same version between platforms, most notably Windows. In this case, however, I think we've accidentally picked up a daily build version or something, because if you run the CI Docker image it reports this:

root@87ac1e844af6:/# clang-format --version
Ubuntu clang-format version 12.0.1-++20210525082622+328a6ec95532-1~exp1~20210525063352.95

Again, we're working on it. Multiple fires to put out right now :)

[pdxcodemonkey]

@alb3rtobr please rebase onto latest develop to fix `clang-format, then this will pass gates and can be merged.

[alb3rtobr]

@alb3rtobr please rebase onto latest develop to fix `clang-format, then this will pass gates and can be merged.

done, thanks!