fix: serve pre-built dist, no build step needed

Dockerfile

@@ -1,12 +1,6 @@
-FROM node:20-alpine AS base
-WORKDIR /app
-COPY package.json ./
-RUN npm install
-COPY . .
-RUN npm run build
-
 FROM nginx:alpine
-COPY --from=base /app/dist /usr/share/nginx/html
+COPY . /usr/share/nginx/html
 COPY nginx.conf /etc/nginx/conf.d/default.conf
+RUN rm -f /usr/share/nginx/html/Dockerfile /usr/share/nginx/html/nginx.conf /usr/share/nginx/html/README.md
 EXPOSE 8080
 CMD ["nginx", "-g", "daemon off;"]