Honoka Culhane

Thanks for the notes, @SomberNight. I added the original `panel-download.html.template` logic back in. I removed js files that the app no longer needs (slideshow related like [`prettyPhoto`](https://github.com/spesmilo/electrum-web/blob/master/js/jquery.prettyPhoto.js), [`cycleLite`](https://github.com/spesmilo/electrum-web/blob/master/js/jquery.cycle.lite.js) or unused...