Update org-chart with end FY20 state of Scalability team structure

Why is this change being made?

The Scalability team org chart was out of date with the current state of the team and reporting structure. This MR only recognises the situation as it is in February 2020.

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what