More granular Gantt charts

[jalondonot]

Context
https://openedx.atlassian.net/wiki/spaces/COMM/pages/4318527513/Redwood.1+Retrospective

Task
Creating a Gantt chart to track every major project/feature for the next release at a more granular level (epics) instead of at a high level (project) to better assess the risk of whether delivering or not each one of the new features and plan the testing process and required capacity better and in advance.