Add code links

Fixes #20

source/_talks/2015-10-14-building-static-websites-sculpin.md

@@ -10,11 +10,5 @@ speakerdeck:
 youtube:
     id: aN53arCKZAU
 image: static-websites-sculpin.png
-code: https://github.com/opdavies/sculpin-demo
 ---
-
-You can [view the full slides][1], including the embedded videos.
-
 Presented at the [PHPSW user group](https://phpsw.uk) in October 2015.
-
-[1]: https://opdavies.github.io/slides-phpsw-sculpin

source/_talks/2016-03-05-drupal-8-module-development.md

@@ -15,7 +15,6 @@ meta:
             type: 'image/png'
             height: 540
             width: 960
-code: https://github.com/opdavies/dclondon16-d8-module
 ---
 In this session, we’ll cover:
 
@@ -30,4 +29,9 @@ What we won’t be covering:
 * Automated testing in PHPUnit or Simpletest.
 * Adding third party libraries and external dependencies via Composer.
 
-Presented at [DrupalCamp London](http://drupalcamp.london) 2016.
+Presented at [DrupalCamp London][1] 2016.
+
+The source code is available on [GitHub][0].
+
+[0]: https://github.com/opdavies/dclondon16-d8-module
+[1]: http://drupalcamp.london

source/_talks/2016-03-08-drupal-vm-generator.md

@@ -7,6 +7,11 @@ speakerdeck:
 youtube:
     id: U1pbKAAO2Wo?t=1h1m37s
 image: drupal-vm-generator.png
-code: https://github.com/opdavies/drupal-vm-generator
 ---
-Presented at the [NWDUG](http://nwdrupal.org.uk) and [Drupal Bristol](https://www.drupalbristol.org.uk) user groups in 2016.
+Presented at the [NWDUG][1] and [Drupal Bristol][2] user groups in 2016.
+
+The source code for the project is available on [GitHub][0].
+
+[0]: https://github.com/opdavies/drupal-vm-generator
+[1]: http://nwdrupal.org.uk
+[2]: https://www.drupalbristol.org.uk