Add video and presentation for Autodiff event (#174)

* Fix tag

* Add video and slides for Autodiff

* Add local build files to gitignore

* Auto-update submodules

* Auto-update submodules

* Fix incorrect tag

---------

Co-authored-by: James Riordon <jriordon@outofcontrol.ca>
Co-authored-by: Read the Docs Bot <rtd-bot@shader-slang.com>

Author: 3 people

.gitignore

@@ -1,5 +1,6 @@
 Gemfile
 Gemfile.lock
+build.sh
 _site/
 upgrade-site.sh
 docs/_build

_posts/2025-09-09-getting-started-with-slang-modularization.md

@@ -4,7 +4,7 @@ title: "Getting Started with Slang: Modularization"
 tagline: "Slang Virtual Meetup"
 date: 2025-09-09 08:00:00 +0000
 categories: [ "video" ]
-tags: [modulariztion]
+tags: [modularization]
 author: ""
 image: "/images/events/2025-07-getting-started-with-slang-modularization-thumbnail.webp"
 source_url: "/event/2025/07/28/getting-started-with-slang-modularization/" 

_posts/2025-10-06-getting-started-with-slang-automatic-differentiation.md

@@ -10,8 +10,12 @@ author: ""
 image: "/images/events/2025-10-21-Slang-Auto-Diff-Banner.webp"
 human_date: "October 21, 2025"
 event_button_label: "Learn More"
+youtube_id: "gUE-RIOwQKI"
 ---
 
+## Presentations
+Powerpoint Slides - [Getting Started with Shader Slang Autodiff](/images/events/2025-10-06-Getting-Started-with-Slang-Autodiff.pdf) (pdf)
+
 ## Automatic Differentiation
 
 Join us for a focused deep dive on automatic differentiation in Slang with Shannon Woods. This session distills the core concepts of autodiff, emphasizing how forward and reverse modes work, how gradients propagate, and how to reason about correctness and efficiency with clear, minimal examples.

_posts/2025-10-27-getting-started-with-shader-slang-automatic-differentiation.md

@@ -0,0 +1,11 @@
+---
+layout: post
+title: "Getting Started with Slang: Automatic Differentiation"
+tagline: "Slang Virtual Meetup"
+date: 2025-10-06 08:00:00 +0000
+categories: [ "video" ]
+tags: [slang]
+author: ""
+image: "/images/events/2025-10-21-Slang-Auto-Diff-Banner.webp"
+source_url: "/event/2025/10/06/getting-started-with-slang-automatic-differentiation/" 
+---