Reorganization of documentation for XDCR

Requesting for reorganization of XDCR documentation as mentioned below:

Cross- Data Center Replication (XDCR)

XDCR fundamentals

What is XDCR
Why XDCR
Use Cases
Benefits

XDCR architecture - (This part is missing from current docs, use the whitepaper (attached) for reference and just copy-paste the entire architecture section), I’ll provide any additional context as necessary.

XDCR core functionalities -

Replication modes
Replication filtering
Replication Prioritization
Network bandwidth throttling
Data Compression
Conflict Resolution Modes - Rev ID, LWW
Auto Failover with Multi-cluster Awareness
Security - RBAC, X.509,Scram-Sha

XDCR for Cloud -

Enabling multi-cloud deployment via XDCR
Enabling hybrid cloud deployment via XDCR
Automated XDCR via Kubernetes (CAO)

Managing XDCR -
(port the existing managing XDCR documentation here)