Algebraic_kernel_d: Remove RS

[afabri]

Summary of Changes

I removed RS in the third party library page, models in the documentation that are wrappers, wrappers, examples, and tests. I did not go through the depreciation process, as I do not expect anybody to use it, as RS has no official support.

Todo: Add to the change log

Release Management

• Affected package(s): Algebraic_kernel_d
• Issue(s) solved (if any): fix #7771

[afabri]

/build:v0

[github-actions[bot]]

The documentation is built. It will be available, after a few minutes, here: https://cgal.github.io/8400/v0/Manual/index.html

[sloriot]

Successfully tested in CGAL-6.0.1-Ic-345

[github-actions[bot]]

This pull-request was previously marked with the label Tested, but has been modified with new commits. That label has been removed.

[sloriot]

Successfully tested in CGAL-6.1-Ic-3