Replace Python development tooling with Make and containerized shell

README.md

@@ -71,7 +71,8 @@ Output is `frontend/app/build/web/`. To inspect that build locally, from the
 repository root:
 
 ```sh
-python3 -m http.server 5123 --bind 127.0.0.1 --directory frontend/app/build/web
+docker run --rm --pull always -p 127.0.0.1:5123:80 \
+  -v "$PWD/frontend/app/build/web:/usr/share/nginx/html:ro" nginx:stable-alpine
 ```
 
 Open [the local app](http://127.0.0.1:5123/). The language selector supports EN/RU