Add "Dashboards" to the main menu

[mireille-raad]

Currently, the main menu has:

We should add "Dashboards". This could be either a dropdown list with links to each dashboard or we can create a landing page, the page will then have descriptions and links.

I am not sure which is better. The dropdown seems more straightforward.

[youknowone]

This is a good idea. The last time I looked for dashboard, I spent more than 5 minutes to look every link in the main page.