Feature Sites for Versions Updated

Pressing on the ZIM 016 in the site banner at left will take you to the features for the version. https://zimjs.com/016 We have now added a submenu bar that links to the features of the latest versions all the way back to ZIM NIO - show in ZIM 015.

The NFT and NIO feature pages are in ZIM (and do not have the submenu bar) whereas the others are HTML pages. Hopefully that minor inconsistency is okay. One day, we may make an equivalent HTML page for ZIM NFT - the NIO will drop off the menu when ZIM 017 comes along.