Show LMS admins which product integrations they have on or off

[mkdir-washington-edu]

The problem
LMS admins aren't always aware of, and thus can't share with the other members of their team, which LMS integrations we're using with their Hypothesis install. For example, having an awareness that we have a VitalSource integration may be handy if at a future date they're tasked with installing the VS LMS app because their school just signed an institutional agreement with VS.

This will also help when LMS admins miss our marketing emails about upcoming product features and the need to communicate with our team to turn them on. For example, if a Canvas admin missed the Canvas Pages integration email, they could still notice that there's a new Canvas-specific integration option in Hypothesis that's currently disabled, with a helpful link to all them to create a support ticket.

The solution
As we continue to develop new information displays off of the Reporting Dashboards, we should create an admin interface (for all Reporting Dashboard admins, not just LMS admins) that displays the currently used integrations in Hypothesis. We don't need to allow control over these integrations, but we should provide a link to more information or to contact the support team for admins who want to explore enabling or disabling integrations.