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/building-static-websites-sculpin.md

@@ -12,29 +12,30 @@ video:
   type: youtube
   id: xRTiWR9nBSA
 events:
-  - name: PHP South West
-    location: Bristol, UK
-    date: 2015-10-14
-    url: https://phpsw.uk/events/2015-10-lightning-talks
-    joindin: https://joind.in/talk/view/15486
-
-  - name: Drupal Yorkshire
-    date: 2021-08-19
-    location: Leeds, UK
-    url: https://www.meetup.com/DrupalYorkshire/events/280100968
-    online: true
-
-  - name: PHP North West (PHPNW)
-    date: 2021-09-07
-    location: Manchester, UK
-    url: https://www.phpnw.org.uk
-    online: true
-
-  - name: GroningenPHP
+  -
+    name: GroningenPHP
     date: 2021-12-09
     location: Groningen, Netherlands
     url: https://www.meetup.com/GroningenPHP/events/281648855
     online: true
+  -
+    name: PHP North West (PHPNW)
+    date: 2021-09-07
+    location: Manchester, UK
+    url: https://www.phpnw.org.uk
+    online: true
+  -
+    name: Drupal Yorkshire
+    date: 2021-08-19
+    location: Leeds, UK
+    url: https://www.meetup.com/DrupalYorkshire/events/280100968
+    online: true
+  -
+    name: PHP South West
+    location: Bristol, UK
+    date: 2015-10-14
+    url: https://phpsw.uk/events/2015-10-lightning-talks
+    joindin: https://joind.in/talk/view/15486
 ---
 
 [Sculpin][0] is a static site generator written in PHP. It converts Markdown