Swap Project logos with icons

sass/_utils.scss

+.image.is-70p {
+  width: 70%;
+  height: 70%;
+}

sass/style.scss

@@ -9,4 +9,5 @@ $title-color: inherit;
 
 @import "./_menu.scss";
 @import "./_content.scss";
+@import "./_utils.scss";
 @import "./_calendar";

templates/frontpage/blocks/projects.html

@@ -10,9 +10,11 @@
       {% set project_section = get_section(path=project_section_path) %}
       <div class="column">
         <div class="card is-shadowless">
-          <figure class="image is-4by3">
-            <a href="/projekte/{{ project_section.extra.project_slug }}"><img src="{{ project_section.extra.logo }}" alt="Logo {{ project_section.title }}" /></a>
-          </figure>
+          <div class="columns is-centered">
+            <figure class="image is-70p">
+              <a href="/projekte/{{ project_section.extra.project_slug }}"><img src="{{ project_section.extra.title_icon }}" alt="Logo {{ project_section.title }}" /></a>
+            </figure>
+          </div>
         </div>
         <div class="card-content">
           <div class="media">