General integration schematic

[dasaderi]

Review integration schematic done by @maria.

[dasaderi]

Diagram: https://github.com/PREreview/api/blob/main/Diagram%20OPS_PREreview.xml
App to edit it: https://app.diagrams.net/

[dasaderi]

Screenshot of 1st diagram of workflow integration presented by @elena-herrera: