feat: ✨ slides for the functional programming talk (#170)

# Description

Slides for the functional programming talk during our in-person time.

No review needed. You all will see it on Thursday.

## Checklist

- [x] Formatted Markdown
- [x] Ran `just run-all`

Author: lwjohnst86

.gitignore

@@ -22,3 +22,5 @@ _site
 _book
 public
 site
+
+**/*.quarto_ipynb

posts/functional-programming-talk-2025/index.qmd

@@ -0,0 +1,20 @@
+---
+title: "A talk about an approach to coding for data analysis or software development"
+description: |
+    A 2 hour, casual talk on functional programming concepts for both
+    data analysis and software development.
+author:
+  - "Luke W. Johnston"
+date: "2025-10-23"
+categories:
+  - presentation
+  - learning
+  - functional programming
+---
+
+We've decided to incorporate more structured peer learning times into our
+in-person meetings. So for our [October
+2025](https://team.seedcase-project.org/events/2025-10-in-person/)
+meeting, I decided to give a talk on functional programming.
+
+The slides can be found [here](./slides.qmd).