Add devcontainer configuration to simplify online editing.

.devcontainer/devcontainer.json

@@ -0,0 +1,28 @@
+{
+    "name": "Python Dev Container",
+    "image": "mcr.microsoft.com/devcontainers/python:3.10",
+    "features": {
+        "ghcr.io/devcontainers/features/docker-in-docker:2": {}
+    },
+    "customizations": {
+        "vscode": {
+            "settings": {
+                "terminal.integrated.defaultProfile.linux": "bash"
+            },
+            "extensions": [
+                "ms-python.python",
+                "ms-python.vscode-pylance"
+            ]
+        }
+    },
+    "postCreateCommand": "pip install -r mkdocs-requirements.txt",
+    "forwardPorts": [
+        8000
+    ],
+    "portsAttributes": {
+        "8000": {
+            "label": "mkdocs Live Preview",
+            "onAutoForward": "openPreview"
+        }
+    }
+}