[Glitch] Change logo version in header based on screen size in web UI

Port 6028d047b9 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/components/columns.scss

@@ -62,10 +62,9 @@ $ui-header-height: 55px;
   height: $ui-header-height;
   position: sticky;
   top: 0;
-  z-index: 2;
+  z-index: 3;
   justify-content: space-between;
   align-items: center;
-  overflow: hidden;
 
   &__logo {
     display: inline-flex;
@@ -75,6 +74,20 @@ $ui-header-height: 55px;
       height: $ui-header-height - 30px;
       width: auto;
     }
+
+    .logo--wordmark {
+      display: none;
+    }
+
+    @media screen and (min-width: 320px) {
+      .logo--wordmark {
+        display: block;
+      }
+
+      .logo--icon {
+        display: none;
+      }
+    }
   }
 
   &__links {