docs: re-home mkdocs sources within this repo (#2149)

docker-compose-mkdocs.yml

@@ -0,0 +1,21 @@
+# This composition can be used to serve up the rendered mkdocs for local authoring.
+#
+# docker compose -f docker-compose-mkdocs.yml -p mkdocs up
+#
+# and then access http://localhost:8000
+
+version: "3.8"
+
+services:
+  mkdocs:
+    build:
+      context: .
+      dockerfile: docs/Dockerfile
+    volumes:
+      - ./mkdocs.yml:/mkdocs/mkdocs.yml
+      - ./docs:/mkdocs/docs
+    command:
+      - serve
+      - --dev-addr=0.0.0.0:8000
+    ports:
+      - "8000:8000"