There's list of community servers in the map description, as well as in the discussions.

To join a community server, navigate to the "Community Servers" tab in the main menu. There, you have two options.

A) Use the "Favorites" tab, click the "Add a Server" button in the bottom-right corner, where you paste the IPs.

B) Use the "Internet" tab and add "vip_" to the "map" filter.