Back-port updated UsersGuide to maint/4.1.x

[casella]

This commits back-ports to maint/4.1.x

• all the updates to the UsersGuide package that were done in Add release notes for v4.1.0 #4327 and already committed to the master branch
• the final suggestions by @LeoGall for the landing page of the documentation, committed to master in Improved summary based on Leo's, Hubertus' and Stefan's feedback #4634.

It also provisionally updates the release dates of 4.1.0, will be updated again here and on the master branch when the library is officially released.

I checked how the documentation looks like in Dymola and OpenModelica with the code of this PR, all looks fine.

This PR was a bit problematic because of the structural changes of #4355 were applied to the master branch after branching off the ReleaseNotes_4.1.0 branch of #4327 more than one year ago and were never cherry-picked properly.

In order to avoid getting crazy with conflict resolution, I back-ported them manually, by adding the content of the Modelica/UsersGuide directory and replacing Modelica/package.mo with the files contained in the master branch.

This is the final PR before we tag RC.1, everything else is already in place. Please review ASAP so we can tag it today and avoid delaying the voting process further.

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[AHaumer]

LGTM
Thanks a lot to @casella and all colleagues working together to enable this release.
For the future we should discuss how to ease the process of generating the release notes.

[Esther-Devakirubai]

Looks Good to me!
Thanks a lot @casella and team!!