Refactor GitHub Actions workflow to install LaTeX dependencies and build document directly, updating artifact upload step

.github/workflows/main.yml

@@ -13,7 +13,9 @@ jobs:
 
     steps:
       - name: Install Node.js
-        uses: actions/setup-node@v4.2.0
+        run: |
+          curl -fsSL https://deb.nodesource.com/setup_20.x | sudo bash - 
+          sudo apt-get install -y nodejs
 
       - name: Set up Git repository
         uses: actions/checkout@v4.2.2