FR: First default dashboard - App

[paolodamico]

General description

Initial implementation of #1659. This task intends to implement the first default dashboard after a user signs up(General app dashboard).

The app dashboard would be comprised from the following graphs:

• Daily active users.
• Weekly user lifecycle.
• Weekly revenue.
• Sales channel attribution. Revenue ($) based on the "Initial Referrer" for the user.
• Sample funnel graph (use version from Figma file).
• Sample pie graph (e.g. feature usage breakdown).
• All time sign ups - cumulative over all time of unique users.
• Repeat visitors - stickiness of $pageviews over time

This would be the default dashboard after creating a team (both on cloud and self-hosted), however we're 50% A/B testing this with a feature flag, app-default-dashboard feature flag can be used.

Additional context

Depending on the results from this dashboard we can continue working on dashboards for other use cases.

Thank you for your feature request – we love each and every one!

[paolodamico]

Forgot to add, the default dashboard also includes a help icon with a short description of the graph (example below)

[paolodamico]

#1942 introduces the capability to create dashboards from templates as well as the template described in this issue, what's missing to close this issue is:

• The template must automatically be used after creating a new project for an app (which includes after sign up) [functionality behind feature flag].
• We need to implement the empty states (see Figma file) which are critical to communicate what's going on, as users won't have any useful data just after signing up.