this is a rebase over sagemath#34985

* Improve camera positioning for threejs

* Changes to sagedoc, stopgap and superseded; one mass replacement

* Another mass replacement

* Another mass replacement

* Another replacement

* Another replacement

* Remove comment numbers

* Fix a couple of strays

* trac ticket -> github issue

* Change checksums back, fix meta-ticket

* Another mass replacement

* Another mass replacement

* Another mass replacement

* Manual fixes

* Small replacement

* Small replacement

* Fix typo

* Add github role to tox

* add explicit formulas to documentation of WeierstrassIsomorphism

* lift documentation from .__init__() to class and tweak

* add doctest for sagemath#20847

* add .torsion_basis() method to EllipticCurve_finite_field

* Revert "Remove comment numbers"

This reverts commit 27cdf3e.

* Revert changes to git_trac.rst

* Switch :github: to :issue:

* Switch from sage-prod to sage in attachment links

* Change trac_number to issue_number

* cross linked matrix method

* Add construction of strongly regular digraph

* A few manual fixes

* Another automatic change

* Undo a bunch of changes in the doc directory

* Another fix

* Try to fix sphinx problem

* Move comment tag inside

* allowing iterables as input

* Fix code style

* generalized fix

* converting iterables

* added is_supergreedy() function

* implemented diff algo, for borderline cases

* correcting function for disjoint set of points

* correcting function

* documentation changes

* minor chagnges

* fixing_failing_tests

* minor documentation correction

* Update linear_extensions.py

* corrected TeX maths in docstrings

* further fixes to supergreedy docstring

* Added Reference

* adding reference

* minor updates

* correcting documentation errors

* correct a wrong change to :trac:

* remove spurrious blank line

* another spurrious line removed

* compute matrix kernels modulo composites

* fix doctests

* docstring style tweak

* adding doctests

* correct the import location (duh...)

* adding colored permutation doctests

* doctests fixes

* replaced "Combining Caron"+c with one unicode character

* Updated SageMath version to 10.0.beta1

---------

Co-authored-by: Kwankyu Lee <ekwankyu@gmail.com>
Co-authored-by: David Roe <roed.math@gmail.com>
Co-authored-by: Lorenz Panny <lorenz@yx7.cc>
Co-authored-by: Marc Mezzarobba <marc@mezzarobba.net>
Co-authored-by: Tobias Diez <code@tobiasdiez.com>
Co-authored-by: Sandstorm831 <gargrohan138@gmail.com>
Co-authored-by: Rohan Garg <76916164+Sandstorm831@users.noreply.github.com>
Co-authored-by: Dima Pasechnik <dima@pasechnik.info>
Co-authored-by: Release Manager <release@sagemath.org>