Add PHPSW Nix lightning talk

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

sculpin/source/_presentations/nix-lightning-talk.md

@@ -0,0 +1,20 @@
+---
+title: Nix and PHP
+type: lightning_talk
+events:
+  - name: PHP South West
+    location: Bristol, UK
+    date: 2025-11-12
+new_events: true
+---
+
+
+{% block description %}
+An impromptu lightning talk and demo about Nix and PHP.
+{% endblock %}
+
+{% block content %}
+An impromptu lightning talk and demo about Nix and PHP as a precursor to my longer [Nix for PHP Developers][0] talk.
+
+[0]: /presentations/nix-for-php-developers
+{% endblock %}