Redesign the AbuseReports index

- Shows when the reported user joined
- Show relative timestamp for when the report was created
- Parse message with restricted Markdown pipeline to autolink URLs

app/views/admin/abuse_reports/_abuse_report.html.haml

@@ -2,19 +2,21 @@
 - user = abuse_report.user
 %tr
   %td
-    - if reporter
-      = link_to reporter.name, reporter
+    - if user
+      = link_to user.name, [:admin, user]
+      .light.small
+        Joined #{time_ago_with_tooltip(user.created_at)}
     - else
       (removed)
   %td
-    = abuse_report.created_at.to_s(:short)
-  %td
-    = abuse_report.message
-  %td
-    - if user
-      = link_to user.name, user
+    - if reporter
+      = link_to reporter.name, [:admin, reporter]
     - else
       (removed)
+    .light.small
+      = time_ago_with_tooltip(abuse_report.created_at)
+  %td
+    = markdown(abuse_report.message.squish!, pipeline: :single_line)
   %td
     - if user
       = link_to 'Remove user & report', admin_abuse_report_path(abuse_report, remove_user: true),

app/views/admin/abuse_reports/index.html.haml

@@ -6,10 +6,9 @@
     %table.table
       %thead
         %tr
+          %th User
           %th Reported by
-          %th Reported at
           %th Message
-          %th User
           %th Primary action
           %th
       = render @abuse_reports