docs: add make target for serving docs locally in docker

Makefile

@@ -807,4 +807,4 @@ docs/serve:
 		-p 127.0.0.1:$(MKDOCS_SERVE_PORT):$(MKDOCS_SERVE_PORT) \
 		-v ${PWD}:/docs \
 		--entrypoint sh $(MKDOCS_IMAGE) \
-		-c 'mkdocs serve --dev-addr=0.0.0.0:$(MKDOCS_SERVE_PORT) -f mkdocs.yml'
+		-c 'mkdocs serve -s --dev-addr=0.0.0.0:$(MKDOCS_SERVE_PORT) -f mkdocs.yml'