fix: update Dockerfile and docker-compose for improved development setup

Dockerfile

@@ -1,5 +1,7 @@
-# STAGE 1: Build the Eleventy site
-FROM node:18-alpine AS builder
+# STAGE 1: Development
+# This stage installs all dependencies (including devDependencies) and copies the source code.
+# It's used as a base for the 'builder' stage and for the development environment via docker-compose.
+FROM node:18-alpine AS development
 WORKDIR /app
 
 # Copy project files and install dependencies
@@ -7,12 +9,15 @@ COPY package*.json ./
 RUN npm install
 COPY . .
 
-# Build the Eleventy site
+# STAGE 2: Builder
+# This stage builds the Eleventy site for production.
+FROM development AS builder
 # The output will be in the default `_site` directory
 RUN npx @11ty/eleventy
 
-# STAGE 2: Setup the production server
-FROM node:18-alpine
+# STAGE 3: Production
+# This stage creates a lean, production-ready image.
+FROM node:18-alpine AS production
 WORKDIR /app
 
 # Copy server dependencies from the builder stage
@@ -21,13 +26,15 @@ COPY --from=builder /app/package*.json ./
 # Install only production dependencies for the server
 RUN npm install --omit=dev
 
-# Copy the server file and the built Eleventy site
-COPY --from=builder /app/server.js .
+# Copy the server, the built Eleventy site, and the data file for the view counter.
+# Note: The paths here are relative to the WORKDIR inside the 'builder' stage (/app).
+COPY --from=builder /app/src/server.js .
 COPY --from=builder /app/_site ./_site
-COPY --from=builder /app/data ./data
+# The server expects the _data directory in /app/_data, and your config places it in src/_data.
+COPY --from=builder /app/src/_data ./_data
 
 # Expose the port the server runs on
-EXPOSE 8080
+EXPOSE 3000
 
 # The command to start the server
-CMD [ "npm", "start" ]
+CMD [ "node", "server.js" ]