Create GitHub Pages docs with Sphinx (#11888)

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # https://github.com/microsoft/vscode-dev-containers/blob/main/containers/python-3/README.md
-ARG VARIANT=3.12-bookworm
+ARG VARIANT=3.13-bookworm
 FROM mcr.microsoft.com/vscode/devcontainers/python:${VARIANT}
 COPY requirements.txt /tmp/pip-tmp/
 RUN python3 -m pip install --upgrade pip \

.devcontainer/devcontainer.json

@@ -7,7 +7,7 @@
 			// Update 'VARIANT' to pick a Python version: 3, 3.11, 3.10, 3.9, 3.8
 			// Append -bullseye or -buster to pin to an OS version.
 			// Use -bullseye variants on local on arm64/Apple Silicon.
-			"VARIANT": "3.12-bookworm",
+			"VARIANT": "3.13-bookworm",
 		}
 	},