Move docs back to optional-dependencies to make readthedocs work

Author: mmcdermott

pyproject.toml

@@ -30,6 +30,9 @@ dependencies = [
 
 [dependency-groups]
 dev = ["pre-commit<4", "ruff", "pytest-cov"]
+
+[project.optional-dependencies]
+
 docs = [
   "mkdocs==1.6.1", "mkdocs-material==9.6.7", "mkdocstrings[python,shell]==0.28.2", "mkdocs-gen-files==0.5.0",
   "mkdocs-literate-nav==0.6.1", "mkdocs-section-index==0.3.9", "mkdocs-git-authors-plugin==0.9.2",