Load list of changes step by step

[smarr]

We should make the change list an "infinite scroll" kind of element.

See for instance here: https://hashnode.com/post/a-super-simple-infinite-scroll-implementation-in-javascriptjquery-ck4i120t900jwmqs15cuo2zbm

//Infinite Scroll
$(window).on("scroll", function() {
 //page height
 var scrollHeight = $(document).height();
 //scroll position
 var scrollPos = $(window).height() + $(window).scrollTop();
 // fire if the scroll position is 300 pixels above the bottom of the page
 if(((scrollHeight - 300) >= scrollPos) / scrollHeight == 0){
   $('.load-more-days-button').click();
  }
});

For this, we'd need paging support in the rebenchdb/dash/8/changes endpoint.
At this point, the most active projects already result in many hundreds of changes, which is >90kb each for at least 3 of the projects.