Index page is very complicated

The index page is very difficult to follow. For someone new to the product, how do they decide which box to choose? Also some TLAs are not explained, for example FSM.

I think it would be clearer if the getting started entries were grouped by type (Cluster, Distributed Data etc), and the different implementations (Java, Scala, Docker etc) relegated to secondary index pages.

Also the index page does not make clear what languages and OSes are supported.

Start with the index page and trace its getting-started entries, noting how the Cluster and Distributed Data groupings relate to the Java, Scala, and Docker implementations. Check how FSM and other TLAs are introduced, then verify that the revised navigation explains the supported languages and operating systems and separates secondary implementation indexes.

Written by the indexing model from the issue text.