Update presentations to use the abstract block

source/_presentations/deploying-php-ansible-ansistrano.md

@@ -77,8 +77,10 @@ events:
     online: true
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+{% block abstract %}
 Great! 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 which is not ideal.
 
 As well provisioning and maintaining your server configuration and running commands, you can also use [Ansible](https://www.ansible.com) to deploy your PHP application - leveraging relevant Ansible modules such as Git and Composer, custom Ansible roles, [Ansible Vault](https://docs.ansible.com/ansible/latest/user_guide/vault.html) for managing secrets, and features such as idempotency out of the box to build a simple deployment playbook. We can then extend that and make it more robust by adding [Ansistrano](https://ansistrano.com) - a port of [Capistrano](https://capistranorb.com) - which adds extra features such as storing multiple builds for each project and the ability to roll-back if needed, customising your build steps using built-in hooks, multi-stage environments and more.
 
 I've been using Ansible and Ansistrano to deploy a variety of PHP projects - including Drupal 7 & 8, Symfony, Laravel and Sculpin, as well as basic HTML websites, and found it to be very flexible and easy to install and use, and by the end of this talk we will have a fully working deployment playbook, deploying real code onto a real server.
+{% endblock %}