Add deployment checklist for Zango project in docs

[kc-diabeat]

Description:

As part of improving the deployment process for Zango project, we need to create a comprehensive deployment checklist in Zango docs. This checklist will help ensure that all necessary steps are taken and best practices are followed during the deployment of Zango project.

Checklist Items:

1. Environment Variables:

   • Updating the correct 'env_type'
   • Secret Key - Process for generating and updating a secure secret.
   • INTERNAL_IPS - Update internal IPs if access to App Panel needs to be restricted
   • Session Timeout
   • Auto Lockout
   • Media Storage
   • Static Storage

2. Hardening:

   • Deactivate/ Delete any default platform users

[kc-diabeat]

@shahharsh176 Pls include additional points that might be missed