chore: remove npm mirror

Dockerfile

@@ -8,10 +8,8 @@ RUN git clone https://github.com/denghongcai/forsaken-mail.git /forsaken-mail
 
 WORKDIR /forsaken-mail
 
-RUN npm config set disturl https://npm.taobao.org/dist
-RUN npm config set registry https://registry.npm.taobao.org
 RUN npm install
 
 EXPOSE 25
 EXPOSE 3000
-CMD npm start
+CMD npm start