Center the header logo for all Devise emails

CHANGELOG

@@ -13,6 +13,7 @@ v 8.9.0 (unreleased)
   - Fix an issue where note polling stopped working if a window was in the
     background during a refresh.
   - Make EmailsOnPushWorker use Sidekiq mailers queue
+  - Redesign all Devise emails. !4297
   - Fix wiki page events' webhook to point to the wiki repository
   - Don't show tags for revert and cherry-pick operations
   - Fix issue todo not remove when leave project !4150 (Long Nguyen)

app/assets/stylesheets/mailers/devise.scss

@@ -38,6 +38,10 @@ table {
     margin: 0 auto;
     text-align: left;
     width: 600px;
+
+    & > td {
+      text-align: center;
+    }
   }
 
   &#body {