docs: update README

Author: kei711

README.md

@@ -27,13 +27,7 @@ yarn run esbuild ./src/index.ts
 
 ```shell
 docker build -t docbase-url-expander .
-docker run --env-file .env -p 3000:3000 --rm docbase-url-expander
-```
-
-### ngrok
-
-```shell
-ngrok http 3000
+docker run --env-file .env --init --rm docbase-url-expander
 ```
 
 ## License