feat(showcase): update rock-paper-scissors category and add santa shuffle

- Changed the category of the Rock Paper Scissors game from "games" to "apps".
- Added a new showcase entry for Santa Shuffle, a Secret Santa gift exchange organizer, including its description, demo link, and technical stack.

Author: Vheissu

content/showcase/rock-paper-scissors/index.md

@@ -2,7 +2,7 @@
 title: "Rock Paper Scissors"
 description: "A classic Rock Paper Scissors game built with Aurelia 2, featuring an elegant UI and computer opponent."
 date: 2024-03-15
-showcase_categories: ["games"]
+showcase_categories: ["apps"]
 github: "Vheissu/aurelia2-rock-paper-scissors"
 demo: "https://aurelia2-rock-paper-scissors.vercel.app/"
 ---

content/showcase/santa-shuffle/index.md

@@ -0,0 +1,19 @@
+---
+title: "Santa Shuffle"
+description: "A free Secret Santa gift exchange organizer that makes creating and managing gift exchanges quick and easy."
+date: 2024-12-01
+showcase_categories: ["apps"]
+demo: "https://santashuffle.app"
+---
+
+## Overview
+
+Santa Shuffle is a delightful web application built with Aurelia 2 that simplifies the process of organizing Secret Santa gift exchanges. Whether you're planning a holiday party for your family, friends, or office, Santa Shuffle makes it effortless to create and manage gift exchanges while maintaining the element of surprise.
+
+## Technical Stack
+
+- **Frontend**: Aurelia 2 with TailwindCSS
+- **State Management**: Built-in Aurelia state management
+- **Styling**: Responsive design with winter-themed aesthetics
+- **Export**: PDF generation using jsPDF
+- **Icons**: Font Awesome for festive iconography