fix: correct DATABASE_URL format in .env.example and update readme for command structure

Author: isSerge

.env.example

@@ -1,4 +1,4 @@
 TELOXIDE_TOKEN=telegram_bot_token
 GITHUB_TOKEN=github_token
-DATABASE_URL=sqlite://data/data.db
-POLL_INTERVAL=10
+DATABASE_URL=sqlite:data/data.db
+POLL_INTERVAL=10

readme.md

@@ -51,7 +51,8 @@ docker-compose.yml        # For running with Docker Compose
 migrations
 src
   ├── bot_handler         # Telegram bot commands and handlers
-  │   └── commands        # Individual command implementations (add, remove, list, help, start)
+  │   └── commands        # Individual command implementations (add, list, help, etc.)
+  |   └── callbacks       # Handlers for callback queries (view repo, toggle label, etc.)
   ├── config.rs           # Environment-based configuration
   ├── dispatcher.rs       # Dispatcher setup for handling Telegram updates
   ├── github              # GitHub API integration using GraphQL