CIP-1612 Reorganize and update MCS docs

Reorganization

• make it easier for users of MCS to find the information they need (e.g. LMC dev team, CIPA developers)

Enhance docs

• provide more context - added several diagrams

Docs: https://developer.skao.int/projects/ska-mid-cbf-mcs/en/cip-1612-update-mid-cbf-docs/