docs: add talk description

src/content/talk/introduction-to-mob-programming.md

@@ -1,6 +1,7 @@
 ---
 title: An introduction to mob programming
-description: ''
+description: |
+  What is mob programming, how does it work, and why should we do it?
 speakerdeck:
   id: f37b16f915d64bc0b4a20f9f965e5353
   ratio: '1.77725118483412'
@@ -10,4 +11,13 @@ events:
     location: Cardiff, Wales
     date: '2022-09-28'
     url: https://www.meetup.com/php-south-wales/events/288359737
+
+  - name: The UK Symfony Meetup
+    location: London, England
+    date: '2023-05-11'
+    url: https://www.meetup.com/symfony/events/293153957
 ---
+
+Pair and mob programming are collaborative approaches to software development where tasks are completed in small groups instead of by individuals.
+
+In this talk, I’ll explain more about mob programming, its benefits and how it works, and then we’ll put it into practice with an interactive mob session where we add a feature to a codebase.