Add GitHub Pages deployment workflow and documentation landing page

Co-authored-by: MrPiglr <31398225+MrPiglr@users.noreply.github.com>

.github/workflows/deploy-docs.yml

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+name: Deploy Documentation to GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'docs/**'
+      - '.github/workflows/deploy-docs.yml'
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: 'docs'
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

docs/index.md

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+# AeThex OS Documentation
+
+Welcome to the AeThex OS documentation portal. This documentation covers various aspects of setting up, configuring, and using the AeThex OS platform.
+
+## 📚 Documentation Index
+
+### Authentication & OAuth
+- [**OAuth Quick Start Guide**](OAUTH_QUICKSTART.md) - Get OAuth working in 5 minutes with Discord, Roblox, and GitHub
+- [**OAuth Setup**](OAUTH_SETUP.md) - Comprehensive OAuth configuration guide
+- [**OAuth Implementation**](OAUTH_IMPLEMENTATION.md) - Technical implementation details for OAuth integration
+- [**Credentials Rotation**](CREDENTIALS_ROTATION.md) - Best practices for managing and rotating API credentials
+
+### Platform & UI
+- [**Platform UI Guide**](PLATFORM_UI_GUIDE.md) - Platform-adaptive UI for mobile, desktop, and web environments
+
+### Security & Access
+- [**Entitlements Quick Start**](ENTITLEMENTS_QUICKSTART.md) - Guide to setting up user entitlements and permissions
+
+## 🚀 Getting Started
+
+If you're new to AeThex OS, we recommend starting with:
+
+1. Review the OAuth Quick Start Guide to set up authentication
+2. Explore the Platform UI Guide to understand the adaptive interface
+3. Configure entitlements for proper access control
+
+## 📖 Additional Resources
+
+For more information about AeThex OS, please visit the [main repository](https://github.com/AeThex-Corporation/AeThex-OS).
+
+## 🤝 Contributing
+
+If you find any issues with the documentation or would like to contribute improvements, please open an issue or pull request in the main repository.
+
+---
+
+*Last updated: 2025-12-28*