Switch to npm install in deploy workflow

Replaces 'npm ci' with 'npm install' in the GitHub Actions deploy workflow to allow for more flexible dependency installation. Also adds 'gh-pages' and related dependencies to package-lock.json for deployment support.

Author: 1batu

.github/workflows/deploy.yml

@@ -29,7 +29,7 @@ jobs:
           cache: 'npm'
 
       - name: Install dependencies
-        run: npm ci
+        run: npm install
 
       - name: Build
         run: npm run build