Improve admin UI

app/views/users/index.html.slim

@@ -1,29 +1,36 @@
+.row
+  .d-flex.flex-row.justify-content-start.align-items-center
+    a.btn.btn-primary href=new_user_path
+      | New user
+    = button_to "Update contestants", "/update_contestants", method: :post, class: "ms-3 btn btn-success"
+    = button_to "Regenerate QR codes", "/regenerate_qrcodes", method: :post, class: "ms-3 btn btn-success"
+
+- @users.each do |user|
+  - if user.admin
+    h3.mt-5 = "#{user.username} (admin)"
+  - else
+    h3.mt-5 = user.username
+
   table.table.table-striped.table-hover
     thead
       tr
         th scope="col"
-        | Id
+          | ID
         th scope="col"
-        | Name
+          | Friendly ID
         th scope="col"
-        | Admin?
+          | # Puzzles
         th scope="col"
-        | # contests
+          | # Participants
     tbody
-    - @users.each do |user|
+      - user.contests.each do |contest|
         tr scope="row"
           td
-          = user.id
+            = contest.id
           td
-          = user.username
+            = contest.friendly_id
           td
-          = user.admin ? "Yes" : "No"
+            = contest.puzzles.length
           td
-          = user.contests.length
+            = contest.contestants.length
         
-.row
-  .col
-    a.btn.btn-primary href=new_user_path
-      | New user
-    = button_to "Update contestants", "/update_contestants", method: :post, class: "mt-3 btn btn-success"
-    = button_to "Regenerate QR codes", "/regenerate_qrcodes", method: :post, class: "mt-3 btn btn-success"