v0.19.0 release notes (#1852)

* pl + qchem versions

* draft release notes

* example + changelog-dev.md

* changelog-dev

* batch_params output

* shorten U decomp example to print well

* need orbitals kwarg when using hf_state as positional came after kwarg

* need orbitals kwarg when using hf_state as positional came after kwarg

* trainable params

* orphan

* contributors

* notes

* HF solver example

* HF solver example

* HF solver text

* doc item for #1724

* item for 1769

* doc item for #1792

* #1804, #1802

* #1824

* pyscf pin

* PR links

* resolve changelog (#1858)

Co-authored-by: agran2018 <45397799+agran2018@users.noreply.github.com>

* Update release_notes.md

* Apply HF wording suggestion from Josh

* fix batch params docstring

* update

* merge batch_params dim_output

* new shape for the output of the batch_params example

* Update doc/releases/changelog-0.19.0.md

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

* transforms order change as suggested

* Update doc/releases/changelog-0.19.0.md

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

* Update doc/releases/changelog-0.19.0.md

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

* shorten ex as suggested

* shorten insert example

* move classical jac change to improvements as suggested

* Update doc/releases/changelog-0.19.0.md

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

* Update doc/releases/changelog-0.19.0.md

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

* Update doc/releases/changelog-0.19.0.md

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

* move is_independent to improvements

* remove sentence as suggested

* Update doc/releases/changelog-0.19.0.md

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

* Update doc/releases/changelog-0.19.0.md

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

* change the order of the improvements based on the suggestions

* rephrase qml.grad/qml.jacobian deprecation date

* Update doc/releases/changelog-0.19.0.md

* no current release tag for v0.18.0

* no -dev

* fix

* fix

* correct GateFabric api link

* JAX interface as improvement

* create_expand_fn suggestion

* requires_grad.png

* GateFabric full path

Co-authored-by: agran2018 <45397799+agran2018@users.noreply.github.com>
Co-authored-by: Josh Izaac <josh146@gmail.com>
Co-authored-by: Romain <rmoyard@gmail.com>

doc/development/release_notes.md

@@ -4,7 +4,7 @@ Release notes
 This page contains the release notes for PennyLane.
 
 
-.. mdinclude:: ../releases/changelog-dev.md
+.. mdinclude:: ../releases/changelog-0.19.0.md
 
 .. mdinclude:: ../releases/changelog-0.18.0.md
 

doc/releases/changelog-0.18.0.md

@@ -1,6 +1,6 @@
 :orphan:
 
-# Release 0.18.0 (current release)
+# Release 0.18.0
 
 <h3>New features since last release</h3>