chore: remove Docker and containerization configuration files

The project no longer requires containerized deployment. Removing nixpacks.toml, Dockerfile, and docker-compose.yml simplifies the repository and aligns with a shift to a different hosting or deployment strategy.

Dockerfile

@@ -1,24 +0,0 @@
-FROM node:18-alpine
-
-WORKDIR /app
-
-# Install dependencies
-COPY package*.json ./
-RUN npm install
-
-# Copy application code
-COPY . .
-
-# Create data directory
-RUN mkdir -p /app/data
-
-# Expose port
-EXPOSE 5000
-
-# Healthcheck
-RUN apk add --no-cache curl
-HEALTHCHECK --interval=30s --timeout=3s \
-  CMD curl -f http://localhost:5000/ || exit 1
-
-# Start server
-CMD ["npm", "start"]

docker-compose.yml

@@ -1,24 +0,0 @@
-version: '3.8'
-
-services:
-  app:
-    build: .
-    ports:
-      - "5000:5000"
-    volumes:
-      - calorie_tracker_data:/app/data
-    environment:
-      - PORT=5000
-      - NODE_ENV=production
-      # Add other environment variables here or use an env_file
-      # - API_NINJAS_KEY=your_key_here
-      # - SECRET_KEY=your_secret_here
-    restart: always
-    healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:5000/"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-
-volumes:
-  calorie_tracker_data:

nixpacks.toml

@@ -1,11 +0,0 @@
-[phases.setup]
-nixPkgs = ["nodejs", "python3", "gcc", "gnumake"]
-
-[phases.install]
-cmds = ["npm install"]
-
-[phases.build]
-cmds = ["mkdir -p data"]
-
-[start]
-cmd = "npm run seed && npm start"