and extend tests accordingly,
and fix `==` for group homomorphisms

(cherry picked from commit 8bea0b6)

* Added arg check to weights

* weight seq of non-semi-standard YT gives error

* Inputs for weight seq tests are now semi-standard

(cherry picked from commit c40f14e)

(cherry picked from commit 2d7a2b0)

Co-authored-by: Max Horn <[email protected]>
(cherry picked from commit 953ad23)

---------

Co-authored-by: HechtiDerLachs <[email protected]>
Co-authored-by: ederc <[email protected]>
Co-authored-by: Lars Göttgens <[email protected]>
Co-authored-by: Max Horn <[email protected]>
(cherry picked from commit e91af41)

(cherry picked from commit b3ab222)

Co-authored-by: Tommy Hofmann <[email protected]>
Co-authored-by: Lars Göttgens <[email protected]>
(cherry picked from commit a0d60ee)

(cherry picked from commit 56c8f1f)

* CI: check for jldoctest end markers and unknown admonitions

* docs: fix two admonitions

* add explanation

* use !== nothing

(cherry picked from commit e8f8ecc)

(cherry picked from commit f96891f)

DOIs added via script from <https://tex.stackexchange.com/a/300474>.
The DOIs were then checked with <https://www.doi2bib.org> and in a
few cases further adjustments were made to the bib data.

(cherry picked from commit fb767f2)

(cherry picked from commit 46d028f)

* Patch search index

This removes anything in search index that is not also present in doc.main.
That is, the search function will not return "hidden" pages, which are not
available via normal navigation.

* Move code to the right place, so its trigerred not just on interactive use

* Add JSON to docs Project.toml

* docs/search: improve doc.main parsing, use .html or / depending on local_build

---------

Co-authored-by: Benjamin Lorenz <[email protected]>
(cherry picked from commit d15b0c9)

(cherry picked from commit 5a737af)
versions adjusted for release branch