Add [SMAU](https://about.gitlab.com/handbook/product/performance-indicators/#stage-monthly-active-users-smau) to the [maturity page ](https://about.gitlab.com/direction/maturity/) per https://docs.google.com/document/d/1nMJzrDfG7C14WP5v7P226oPFuXkwqIk7bdIT8ai0DNU/edit#bookmark=id.3e72r4glu8go Since we currently pull the Sisense chart into the KPI page, we should be able to use the same code to pull it into the Maturity page. Tasks: - [x] Consult with UX/design on where to drop the chart @fseifoddini - [x] Implement with an engineer to make sure page structure doesn't break