Add /dbo page

A landing page for my upcoming talk at PHP Oxford.

source/_pages/bco.md

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+---
+title: Hi, PHP Oxford!
+---
+
+{% block head_meta %}
+<meta name="robots" content="noindex">
+{% endblock %}
+
+{% block content %}
+Thanks for attending my lighting talk on [Build Configs](/build-configs).
+
+[These are the slides](/talks/building-build-configs) I presented and the example video:
+
+{% include 'youtube-video' with { id: 'LkhsdmxReUc'} %}
+
+From nothing to a working Drupal 10 website in less than a minute!
+
+If you have any further questions, let me know.
+
+## Can we work together?
+
+[Get in touch](/contact) if you're interested in using Build Configs-based managed configuration files in your projects (I offer one-off implementations or ongoing updates via a subscription), or if we can [work together another way](/pricing).
+
+## While you're here
+
+Why not join my [daily email list](/daily) or register for my upcoming [free email course](/atdc) on automated testing in Drupal?
+
+Oliver
+{% endblock %}