Sunbird installation - Release 2.3.0

Please follow the below order of steps to install Sunbird 2.3.0

1. About Sunbird and Pre-requisite
2. Load balancer Setup
3. Ansible Variables
   
   1. Additional variables for Core service only
4. Jenkins Setup
5. Understanding Jenkins scripts, jobs, jobs parameters and variables
6. Running Builds, Artifact Uploads, and Deployments
7. Few Jenkins tweaks