fix: rename application from Keep to Mento in UI and docs

- Update sidebar.tsx to display "Mento" instead of "Keep"
- Update README.md title from "Keep Notes" to "Mento"
- Update DOCKER_DEPLOYMENT.md references to "Mento"
- Update deploy.sh script comments to use "Mento"
- Add DOCKER-SETUP.md with Docker configuration guide

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

keep-notes/README.md

@@ -1,8 +1,8 @@
-# Keep Notes - Google Keep Clone
+# Mento - Google Keep Clone
 
 A beautiful and feature-rich Google Keep clone built with modern web technologies.
 
-![Keep Notes](https://img.shields.io/badge/Next.js-16-black)
+![Mento](https://img.shields.io/badge/Next.js-16-black)
 ![TypeScript](https://img.shields.io/badge/TypeScript-5.0-blue)
 ![Tailwind CSS](https://img.shields.io/badge/Tailwind-4.0-38bdf8)
 ![Prisma](https://img.shields.io/badge/Prisma-7.0-2d3748)