Technical overview for Project Cumulus service

[pjenvey]

We need to dig into our upcoming needs for Project Cumulus and create a Technical overview doc of what we plan to build.

[pjenvey]

Adjusting to be technical docs around the new service

[pjenvey]

Doc lives here: https://docs.google.com/document/d/12hV_4b6Ur_rpdk1ic7OYOVL_v6i_F886RGXtch60-qg/edit#heading=h.z84bpq7ttbo1