chore: clean up repo, add README and .gitignore

Dockerfile

@@ -1,7 +1,16 @@
-FROM node:16-alpine
+FROM node:20-alpine
+
 WORKDIR /app
+
+# Copy package files first for better layer caching
 COPY package*.json ./
-RUN npm install
+
+# Install dependencies
+RUN npm ci --only=production
+
+# Copy application code
 COPY . .
+
 EXPOSE 3000
-CMD ["npm", "start"]
+
+CMD ["node", "server.js"]