Fix mobile styles for commit history

Signed-off-by: Alexis Sellier <self@cloudhead.io>

src/base/projects/Commit/CommitAuthorship.svelte

@@ -26,6 +26,12 @@
   .authorship .avatar:not(:first-child) {
     margin-left: 0.125rem;
   }
+
+  @media (max-width: 720px) {
+    .authorship {
+      display: none;
+    }
+  }
 </style>
 
 <span class="authorship text-xsmall">

src/base/projects/Commit/CommitTeaser.svelte

@@ -61,13 +61,19 @@
     margin: 0 1rem 0 0;
   }
 
-  @media (max-width: 960px) {
+  @media (max-width: 720px) {
     .hash {
       padding-right: 0.5rem;
     }
     .hash {
       font-size: 0.75rem;
     }
+    .column-center {
+      overflow: hidden;
+    }
+    .column-right {
+      display: none !important;
+    }
     .summary {
       overflow: hidden;
       white-space: nowrap;