Follow RTD's deprecation of Sphinx context injection at build time

docs/source/conf.py

@@ -30,6 +30,7 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
+import os
 import andes
 import shutil
 
@@ -131,6 +132,10 @@
     "doc_path": "docs/source",
 }
 
+# Tell Jinja2 templates the build is running on Read the Docs
+if os.environ.get("READTHEDOCS", "") == "True":
+    html_context["READTHEDOCS"] = True
+
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".

docs/source/release-notes.rst

@@ -11,6 +11,7 @@ v1.9 Notes
 
 v1.9.3 (2024-04-XX)
 -------------------
+- Follow RTD's deprecation of Sphinx context injection at build time
 - In symbolic processor, most variables are assumed to be real, except some
   services that are specified as complex. This will allow generating simplified
   expressions.