Enable containerization for simplified deployment and scaling of the app

Adds Dockerfile, docker-compose files, and deployment scripts for containerizing the React/Express app.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 3a22ac80-cd1d-4441-9e36-f24fc2f4c3de
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3478f7c3-db8c-4fca-9165-3adbdf1b5829/e8da43e7-d99c-4328-9fdc-485bdeecffc1.jpg

.dockerignore

@@ -0,0 +1,20 @@
+node_modules
+npm-debug.log
+.git
+.gitignore
+README.md
+.env
+.env.local
+.env.production.local
+.env.development.local
+.env.test.local
+dist
+coverage
+.nyc_output
+.vscode
+.idea
+*.log
+*.tgz
+*.tar.gz
+.DS_Store
+Thumbs.db