Consistent ordering and formatting for talk events

Use a consistent format for talk events, with the most recent talk at
the top of the list with the rest in a descending order.

This removes the need to use a `reverse` filter in the events partial.

source/_talks/configuring-all-the-things-drupal-8.md

@@ -1,16 +1,14 @@
 ---
 title: "Configuring all the Things (in Drupal 8)"
 description: A short notice talk on configuration management in Drupal 8, and things I’ve learned working on my current Drupal 8 project.
-
 speakerdeck:
   id: 6de3fe8947a34727b79eb9d9dcc66bf2
   ratio: "1.37081659973226"
   url: https://speakerdeck.com/opdavies/configuring-all-the-things-in-drupal-8
-
 video: ~
-
 events:
-  - name: Drupal Bristol
+  -
+    name: Drupal Bristol
     location: Bristol, UK
     url: https://www.drupalbristol.org.uk
     date: 2018-07-25