Analytics: Add pie chart for top 5 main versions

The pie chart with the top 5 versions of Home Assistant is great, but I think it would also be interesting to see the top 5 main versions in the future (when there are more than just one main version released). Therefore it would be great to have a third pie chart that merges all patch versions to for example 2021.4.X.

This was implemented a while back and is showing on that site.