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/deploy.sh

@@ -1,11 +1,11 @@
 #!/bin/bash
 
-# Keep Notes Docker Deployment Script
-# This script helps you build and deploy Keep Notes on Proxmox/Docker
+# Mento Docker Deployment Script
+# This script helps you build and deploy Mento on Proxmox/Docker
 
 set -e
 
-echo "🚀 Keep Notes Docker Deployment"
+echo "🚀 Mento Docker Deployment"
 echo "================================"
 echo ""