Fix Docker Compose version warning and improve script permissions

DOCKER COMPOSE:
- Removed obsolete 'version' attribute from docker-compose.yml
- Keeps db-ui image as ghcr.io/n7olkachev/db-ui:latest

SCRIPT PERMISSIONS:
- Updated README.md with recursive chmod command: find . -name '*.sh' -exec chmod +x {} \;
- Updated QUICKSTART.md with Step 0: Make Scripts Executable
- Removed individual chmod commands from each step
- Single command makes all .sh files executable at once

DOCUMENTATION:
- Renumbered steps in QUICKSTART.md for clarity
- Step 0: Make Scripts Executable
- Step 1: Install Dependencies (Optional)
- Step 2: Start Docker Containers
- Step 3: Initialize Database Schema
- Step 4: Generate Test Data

This resolves the Docker Compose warning and simplifies the setup process with a single chmod command.

docs/QUICKSTART.md

@@ -2,14 +2,18 @@
 
 ## 🚀 Get Up and Running in 5 Minutes
 
-### Step 0: Install Dependencies (Optional - 5 minutes)
+### Step 0: Make Scripts Executable
+
+```bash
+# Make all .sh files executable recursively
+find . -name "*.sh" -exec chmod +x {} \;
+```
+
+### Step 1: Install Dependencies (Optional - 5 minutes)
 
 **If you don't have Docker, PostgreSQL client (psql), or other required tools:**
 
 ```bash
-# Make script executable
-chmod +x scripts/install-dependencies.sh
-
 # Run the installer
 ./scripts/install-dependencies.sh
 ```
@@ -25,7 +29,7 @@ chmod +x scripts/install-dependencies.sh
 
 ---
 
-### Step 1: Start Docker Containers (1 minute)
+### Step 2: Start Docker Containers (1 minute)
 
 ```bash
 # From the project root directory
@@ -46,12 +50,9 @@ You should see both `business_analytics_db` and `business_analytics_ui` running.
 
 ---
 
-### Step 2: Initialize Database Schema (1 minute)
+### Step 3: Initialize Database Schema (1 minute)
 
 ```bash
-# Make script executable (first time only)
-chmod +x scripts/setup-database.sh
-
 # Run setup
 ./scripts/setup-database.sh
 ```
@@ -71,12 +72,9 @@ chmod +x scripts/setup-database.sh
 
 ---
 
-### Step 3: Generate Test Data (15-30 minutes)
+### Step 4: Generate Test Data (15-30 minutes)
 
 ```bash
-# Make script executable (first time only)
-chmod +x data/generate_data.sh
-
 # Run data generation
 ./data/generate_data.sh
 ```