Add the Release Notes link to the navigation
Add the Release Notes link to the navigation

SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io