Split out a docs dependency group

.readthedocs.yaml

@@ -10,7 +10,7 @@ build:
   commands:
     # Install uv and sync dependencies from uv.lock
     - pip install uv
-    - uv sync --frozen
+    - uv sync --frozen --no-dev --group docs
     - uv run sphinx-build -b html docs $READTHEDOCS_OUTPUT/html
 
 # Build documentation from the docs/ directory using Sphinx

README.rst

@@ -82,3 +82,11 @@ I use `uv <https://docs.astral.sh/uv/>`_, and if you do too: you just clone this
 to your computer, then run ``uv sync`` in the root directory.  Example usage::
 
     uv run pytest
+
+For docs, install only the docs dependencies with::
+
+    uv sync --no-dev --group docs
+
+Or to install everything (all dependency groups), run::
+
+    uv sync --all-groups

pyproject.toml

@@ -31,9 +31,8 @@ dev = [
     "mypy>=1.4.1",
     "numpy>=1.21.6",
     "pytest>=7.4.4",
-    "sphinx>=4.3.2",
-    "sphinx-autobuild>=2021.3.14",
 ]
 docs = [
-    "sphinx-autobuild>=2021.3.14",
+    "sphinx>=7.4.7; python_version >= '3.12'",
+    "sphinx-autobuild>=2021.3.14; python_version >= '3.12'",
 ]