[Glitch] Add table of contents to about page

Port SCSS changes from d930eb88b6 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

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

@@ -143,6 +143,63 @@
     grid-row: 3;
   }
 
+  @media screen and (max-width: $no-gap-breakpoint) {
+    grid-gap: 0;
+    grid-template-columns: minmax(0, 100%);
+
+    .column-0 {
+      grid-column: 1;
+    }
+
+    .column-1 {
+      grid-column: 1;
+      grid-row: 3;
+    }
+
+    .column-2 {
+      grid-column: 1;
+      grid-row: 2;
+    }
+
+    .column-3 {
+      grid-column: 1;
+      grid-row: 4;
+    }
+  }
+}
+
+.grid-4 {
+  display: grid;
+  grid-gap: 10px;
+  grid-template-columns: 1fr 1fr 1fr 1fr;
+  grid-auto-columns: 25%;
+  grid-auto-rows: max-content;
+
+  .column-0 {
+    grid-column: 1 / 5;
+    grid-row: 1;
+  }
+
+  .column-1 {
+    grid-column: 1 / 4;
+    grid-row: 2;
+  }
+
+  .column-2 {
+    grid-column: 4;
+    grid-row: 2;
+  }
+
+  .column-3 {
+    grid-column: 2 / 5;
+    grid-row: 3;
+  }
+
+  .column-4 {
+    grid-column: 1;
+    grid-row: 3;
+  }
+
   .landing-page__call-to-action {
     min-height: 100%;
   }
@@ -191,6 +248,11 @@
     }
 
     .column-3 {
+      grid-column: 1;
+      grid-row: 5;
+    }
+
+    .column-4 {
       grid-column: 1;
       grid-row: 4;
     }