Update "jekyll-gh-pages.yml" partially and rename it

Author: ShreckYe

.github/workflows/jekyll-gh-pages.yml .github/workflows/demo-gh-pages.yml.github/workflows/jekyll-gh-pages.yml renamed to .github/workflows/demo-gh-pages.yml

@@ -1,10 +1,10 @@
-# Sample workflow for building and deploying a Jekyll site to GitHub Pages
-name: Deploy Jekyll with GitHub Pages dependencies preinstalled
+name: Deploy the demo to GitHub Pages
 
 on:
-  # Runs on pushes targeting the default branch
   push:
-    branches: ["main"]
+    branches: [ "*" ] # TODO for testing purposes now, change to "release"
+  pull_request:
+    branches: [ "*" ] # TODO for testing purposes now, change to "release"
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch: