Add GAFF-based example back

Author: mattwthompson

devtools/conda-envs/examples_env.yml

@@ -18,10 +18,10 @@ dependencies:
     - openff-nagl
     # - openff-fragmenter
     # - openff-qcsubmit
-    - openmmforcefields=0.12|>=0.14 # https://github.com/openmm/openmmforcefields/pull/329
+    - openmmforcefields =0.14
     - gromacs >=2021=nompi*
     - lammps
     - rich
     - jax
-    - parmed<4
-    - nglview>=3.0.6,<3.1.0
+    - parmed <4
+    - nglview ~=3.0.6

source/_ext/cookbook/globals_.py

@@ -91,10 +91,8 @@
 be rendered if they're in a cache.
 """
 
-OPTIONAL_NOTEBOOKS: list[str] = [
-    # ".*/experimental/.*",
-    "openforcefield/openff-interchange/experimental/openmmforcefields/gaff.ipynb",
-]
+# ".*/experimental/.*",
+OPTIONAL_NOTEBOOKS: list[str] = list()
 """
 Notebooks whose execution failure will not cause notebook processing to fail.