Custom dashboards misc additions

[Guaris]

How to add the “Viewer” role and what users will be able to see / do with that role. We must also mention what you need to be able to actually manage custom dashboards (aka Analytics Admin).

How to add tiles – what tiles are and what possible paths a user can take to add a chart (from scratch vs from existing report).

How to pin filters.

A short paragraph about our quickstart dashboard templates. Don’t think we have to describe each individual but it would be nice to mention that these exist and what benefits templates provide.

Update to our “Advanced Analytics capabilities” table to add custom dashboards.