Use four spaces in frontmatter blocks

source/_talks/deploying-drupal-fabric.md

@@ -2,26 +2,26 @@
 title: "Deploying Drupal with Fabric"
 description: How to use Fabric, a Python command line based library, to deploy your Drupal applications.
 meta:
-  og:
-    title: Deploying Drupal with Fabric
-    description: "You've built your Drupal site, now learn how to deploy it with Fabric."
-    type: website
+    og:
+        title: Deploying Drupal with Fabric
+        description: "You've built your Drupal site, now learn how to deploy it with Fabric."
+        type: website
 speakerdeck:
-  id: 40d1eca4bd484afc86295924fff5dd41
-  ratio: "1.77777777777778"
-  url: "https://speakerdeck.com/opdavies/deploying-drupal-and-anything-else-with-fabric"
-  embed: '<script async class="speakerdeck-embed" data-id="" data-ratio="" src="//speakerdeck.com/assets/embed.js"></script>'
+    id: 40d1eca4bd484afc86295924fff5dd41
+    ratio: "1.77777777777778"
+    url: "https://speakerdeck.com/opdavies/deploying-drupal-and-anything-else-with-fabric"
+    embed: '<script async class="speakerdeck-embed" data-id="" data-ratio="" src="//speakerdeck.com/assets/embed.js"></script>'
 events:
-  -
-    name: Drupal Somerset
-    location: Glastonbury, UK
-    date: 2017-10-26
-  -
-    name: DrupalCamp Dublin 2017
-    location: Dublin, Ireland
-    url: http://2017.drupal.ie
-    date: 2017-10-20
-    time: "15:00 - 15:40"
+    -
+        name: Drupal Somerset
+        location: Glastonbury, UK
+        date: 2017-10-26
+    -
+        name: DrupalCamp Dublin 2017
+        location: Dublin, Ireland
+        url: http://2017.drupal.ie
+        date: 2017-10-20
+        time: "15:00 - 15:40"
 ---
 
 You’ve built your website, and now you just need to deploy it. There are various ways that this could be done - from (S)FTP, to SCP and rsync, to running commands like “git pull” and “composer install” directly on the server (not recommended).