Remove example DB connection scripts and document env variable

Author: hexawulf

.env.example

@@ -1,6 +1,7 @@
 # Port Configuration
 PORT=3001
 # PostgreSQL Configuration
+# Replace with the connection string for your database
 DATABASE_URL=postgresql://username:password@localhost:5432/codepatchwork
 PGDATABASE=codepatchwork
 PGUSER=username