feedback ds: add leaps link in nav bar logo

_includes/navigation.html

 <nav>
-  <img src='{{ "/assets/images/leaps-logo.png" | relative_url }}' alt="LEAPS logo">
+  <a href="https://leaps-initiative.eu/"><img src='{{ "/assets/images/leaps-logo.png" | relative_url }}' alt="LEAPS logo"></a>
   <ul>
     {% for item in site.data.navigation %}
       <li>

_sass/nav.scss

@@ -10,8 +10,9 @@ nav {
   align-items: center;
   padding: $padding-std;
 
-  img {
+  a img {
     width: $margin-std;
+    padding-top: $padding-small;
   }
   
   ul {