Add migration scripts and preload participation awards script

- Created migration index file to manage database migrations.
- Added script to preload participation awards and related blog posts into the CMS.
- Introduced new types and default data for application phases.
- Added award articles data structure for the upcoming awards.

.env.example

@@ -1,8 +1,8 @@
-# Database connection string
-DATABASE_URL=mongodb://127.0.0.1/your-database-name
+# SQLite database connection string
+DATABASE_URL=file:./content.db
 
-# Or use a PG connection string
-#DATABASE_URL=postgresql://127.0.0.1:5432/your-database-name
+# VPS production example:
+# DATABASE_URL=file:/var/www/bmp-website/shared/content.db
 
 # Used to encrypt JWT tokens
 PAYLOAD_SECRET=YOUR_SECRET_HERE