refactor: Remove the sortable_date for talks

Automatically calculate the sortable date for a talk using the event dates. This means that the `sortable_date` in the YAML front matter can be removed. Fixes #4
2021-09-08 23:47:14 +01:00 · 2021-09-08 23:47:14 +01:00 · efbd099515
commit efbd099515
parent 42e0ae1297
36 changed files with 30 additions and 34 deletions
--- a/source/_talks/so-what-is-this-drupal-thing.md
+++ b/source/_talks/so-what-is-this-drupal-thing.md
@ -10,7 +10,6 @@ events:
        location: Cardiff, UK
        url: http://unifieddiff.co.uk
        date: 2012-09-05
-sortable_date: 2012-09-05
 ---

 My very first talk, where I talk about Drupal, what it is and what it can do.