initial commit of the hawkBit documentation (#343)

Signed-off-by: Michael Hirsch <michael.hirsch@bosch-si.com>

docs/src/main/resources/js/app.js

@@ -0,0 +1,19 @@
+$(function(){
+      var headerScroll = 300;
+      $(window).scroll(function() {
+      var scroll = getScroll();
+      if ( scroll >= headerScroll ) {
+        $('.navbar-lp').addClass('scroll');
+        $('.navbar-lp').addClass('scroll-bg');
+        }
+      else {
+        $('.navbar-lp').removeClass('scroll');
+        $('.navbar-lp').removeClass('scroll-bg');
+        }
+});
+
+
+function getScroll() {
+      return window.pageYOffset || document.documentElement.scrollTop;
+      }
+ });