Add GitHub deployment instructions

Provide instructions for setting up a GitHub Actions pipeline to build and deploy the React application to GitHub Pages.

Author: lovable-dev[bot]

.github/workflows/deploy.yml

@@ -0,0 +1,44 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '18'
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Build
+      run: npm run build
+
+    - name: Setup Pages
+      uses: actions/configure-pages@v4
+
+    - name: Upload artifact
+      uses: actions/upload-pages-artifact@v3
+      with:
+        path: './dist'
+
+    - name: Deploy to GitHub Pages
+      id: deployment
+      uses: actions/deploy-pages@v4

vite.config.ts

@@ -5,7 +5,7 @@ import { componentTagger } from "lovable-tagger";
 
 // https://vitejs.dev/config/
 export default defineConfig(({ mode }) => ({
-  base: "/",
+  base: process.env.NODE_ENV === 'production' ? '/peppy-presenter-kit/' : '/',
   server: {
     host: "::",
     port: 8080,