feat: cron job separation

[Nadeera3784]

This pull request involves relocating the cron job from the www.ts file to a separate server. The key changes and reasons for this modification are outlined below:

Changes Made:

• startCronJobs() function removed from www.ts
• startCronJobs() moved to new server as cron.ts
• Cron server start command added to the package.json
• Instruction added to the documentation

Reasons for the change:

• By offloading the cron job to a separate server, we can reduce the load on the main application server, enhancing its performance and responsiveness.
• Running the cron job on a dedicated server minimizes the risk of it being affected by the main server's workload or potential downtimes.
• This change allows for easier scaling of both the main application and the cron job independently, improving overall system scalability.
• Separating concerns between the main application logic and scheduled tasks simplifies maintenance and future updates.