Update README.md to include HalfStack reference

Author: carlyrichmond

README.md

@@ -2,7 +2,7 @@
 
 ## Image Classification using TensorFlow.js and Elasticsearch
 
-This repo documents my exciting journey into learning machine learning practices for the web. It is featured in the talk of the same name at [Devoxx UK 2024](https://www.devoxx.co.uk/speaker-details/?id=4606).
+This repo documents my exciting journey into learning machine learning practices for the web. It is featured in the talk of the same name at [Devoxx UK 2024](https://www.devoxx.co.uk/speaker-details/?id=4606) and [HalfStack London 2024](https://halfstackconf.com/london#carly-richmond).
 
 ![](./slides/screenshots/game/game-cake-page.png)
 
@@ -111,4 +111,4 @@ Thanks go to the fantastic bakers out there making hyper-realistic cakes that in
 6. https://juliemcallistercakes.com
 7. https://www.thesweetstopofrva.com
 
-Thanks also to [Unsplash](https://unsplash.com/) and their amazing contributors who allowed me to find non-cake images through the [JavaScript wrapper unsplash-js](https://www.npmjs.com/package/unsplash-js) of the [Unsplash API](https://unsplash.com/documentation). 
+Thanks also to [Unsplash](https://unsplash.com/) and their amazing contributors who allowed me to find non-cake images through the [JavaScript wrapper unsplash-js](https://www.npmjs.com/package/unsplash-js) of the [Unsplash API](https://unsplash.com/documentation).