Fix build script, update README with build instructions

README.md

@@ -5,10 +5,7 @@ Front-end web application for OTA administration.
 ## Setup
 
 ```bash
-# Install dependencies
 npm install
-
-# Run locally
 npm start
 # Access at http://localhost:3000
 ```
@@ -16,13 +13,9 @@ npm start
 ## Build & Deploy
 
 ```bash
-# Build for mini environment
-npm run build
-
-# Build Docker image
+# Build and push Docker image
 docker build --build-arg ENVIRONMENT=mini -t gitea.mini.cloud.fiskerinc.com/admin/ota-admin-portal:latest .
-
-# Push to Gitea registry
+docker login gitea.mini.cloud.fiskerinc.com -u admin
 docker push gitea.mini.cloud.fiskerinc.com/admin/ota-admin-portal:latest
 ```