refactored items list to use handlebars partials

Additions:
 - added flexnowrap CSS class -> no strange wrapping of item lines

Changes:
- reduced most of the non-maintainable HTML-code repitition
- made item list entries as flat as possible

src/scss/global/_flex.scss

@@ -32,6 +32,10 @@
     }
 }
 
+.flexnowrap {
+    flex-wrap: nowrap;
+}
+
 .flexcol {
     display: flex;
     flex-direction: column;