docs: update deploy instructions to clarify the requirement of the buildx Docker plugin

README.org

@@ -25,10 +25,9 @@ Join our [[https://mto.vern.cc/#/#cobra-frontends:vern.cc][Matrix room]] for sup
 
 * Deploy with docker
 #+BEGIN_SRC
-rye sync
 rye build --wheel --clean
-docker build . --tag rural-dict
-docker-compose up -d
+docker buildx build . --tag rural-dict
+docker compose up -d
 #+END_SRC
 
 * Dependencies