deposit-update-chart: Clarify sequence diagram
This also drops the deprecated committed png file.
Related to T2618
Test Plan
tox
Migrated from D4257 (view on Phabricator)
staging instance, all data can be removed at all time
This also drops the deprecated committed png file.
Related to T2618
tox
Migrated from D4257 (view on Phabricator)