Release notes `v0.24.0` (PennyLaneAI#2701)

* Update

* Reorganization new features

* Typo

* Check all PRs

* Typo removed

* Add 2688

* Isaac changes up to ~Improvements

* Isaac full pass through release notes

* Add rc

* Math rendering

* Add grad example

* Math rendering again

* Change matrices

* Remove matrices

* Reorganize

* Math rendering and ECR description

* Took out matrix definitions of IsingXY and ECR

* Reference for IsingXY

* vn_entropy fix names

* changelog changes

* Add bug fix ham wires

* more

* Apply suggestions from code review

Co-authored-by: Romain Moyard <rmoyard@gmail.com>

* NGD link

* Small edits

* op_math.Pow more descriptive

* Correct some values

* Include update

* Apply suggestions from my code review (very minor grammar)

* lightning qubit additions

* Remove PL-lightning stuff

* Move qchem PR

* Removed PL lightning contributors

* Remove more PL lightning contributors

* Update version

* Contributors full stop

* Trigger CI

Co-authored-by: Isaac De Vlugt <isaacdevlugt@gmail.com>
Co-authored-by: Antal Szava <antalszava@gmail.com>
Co-authored-by: Josh Izaac <josh146@gmail.com>
Co-authored-by: Isaac De Vlugt <34751083+isaacdevlugt@users.noreply.github.com>

Fix PennyLane v0.23.1 to work with Autoray 0.3.1 (PennyLaneAI#2548)

* Fix PennyLane to work with Autoray 0.3.1

* fix

* update

* add new changelog file

* Update doc/releases/changelog-0.23.1.md

Co-authored-by: antalszava <antalszava@gmail.com>

Co-authored-by: antalszava <antalszava@gmail.com>

Remove typo

Trigger CI

Fix queuing unexpected operators with qml.measure; changelog

Pin Lightning `>=0.22` (PennyLaneAI#2324)

* pin lightning >=0.22

* Update tests.yml

Co-authored-by: Josh Izaac <josh146@gmail.com>

Bump the requirement of PennyLane-Lightning to v0.21.0 in `setup.py` (P…

…ennyLaneAI#2177)

* Bump the requirement of PennyLane-Lightning in setup.py

* Update setup.py

* Update setup.py

Co-authored-by: Josh Izaac <josh146@gmail.com>

`v0.20.0` release notes (PennyLaneAI#1977)

* current release

* rename latest changelog

* reorder the entries, create sections

* version, release notes file

* Update doc/releases/changelog-0.20.0.md

* Update doc/releases/changelog-0.20.0.md

Co-authored-by: Josh Izaac <josh146@gmail.com>

* Update doc/releases/changelog-0.20.0.md

Co-authored-by: Josh Izaac <josh146@gmail.com>

* init module: breaking

* Apply suggested changes

* Apply suggested changes

* rendering issues

* mutable kwarg

* apply suggestions

* move to breaking changes

* Lie opt example

* Update doc/releases/changelog-0.20.0.md

Co-authored-by: Josh Izaac <josh146@gmail.com>

* transformation example in the notes

* updates

* Fix examples

* fix refs

* contributors

* More PRs listed

* PauliError

* PauliError

* custom ops as attribute

* Update changelog-0.20.0.md

* Update changelog-0.20.0.md

Co-authored-by: Josh Izaac <josh146@gmail.com>

contributors for the bug fix release

contributors