Add cell cycle scoring notebook (#195)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: flying-sheep

.readthedocs.yml

@@ -1,8 +1,8 @@
 version: 2
 build:
-  os: ubuntu-22.04
+  os: ubuntu-24.04
   tools:
-    python: "3.12"
+    python: "3.13"
 sphinx:
   configuration: conf.py
   fail_on_warning: true

_static/css/custom.css renamed to _static/css/warning.css

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import os
 from datetime import UTC, datetime
 from importlib.metadata import metadata
 from types import MappingProxyType
@@ -63,7 +64,12 @@
     use_repository_button=True,
 )
 html_static_path = ["_static"]
-html_css_files = ["css/custom.css"]
+# include a warning background on RTD for everything but PR builds
+html_css_files = (
+    ["css/warning.css"]
+    if os.environ.get("READTHEDOCS") and os.environ.get("READTHEDOCS_VERSION_TYPE") != "external"
+    else []
+)
 html_logo = "_static/img/Scanpy_Logo_BrightFG.svg"
 
 # -- Notebook settings ----------------------------------------------------