[Glitch] Redesign public hashtag page to use a masonry layout

Port bc642ac24b to glitch flavour

app/javascript/flavours/glitch/styles/widgets.scss

@@ -425,3 +425,30 @@
     border-radius: 0;
   }
 }
+
+$maximum-width: 1235px;
+$fluid-breakpoint: $maximum-width + 20px;
+
+.statuses-grid {
+  min-height: 600px;
+
+  &__item {
+    width: (960px - 20px) / 3;
+
+    @media screen and (max-width: $fluid-breakpoint) {
+      width: (940px - 20px) / 3;
+    }
+
+    @media screen and (max-width: $no-gap-breakpoint) {
+      width: 100vw;
+    }
+  }
+
+  .detailed-status {
+    border-radius: 4px;
+
+    @media screen and (max-width: $no-gap-breakpoint) {
+      border-bottom: 1px solid lighten($ui-base-color, 12%);
+    }
+  }
+}