Document slides landing page

Author: ShuhaoZhangTony

README.md

@@ -26,4 +26,7 @@ chmod +x setup.sh
 The lecture slides live in a separate repository (PDF + LaTeX). This repo is intended to be **public** so students can browse and run the code.
 
 - Primary slides PDF (GitHub Pages): [https://intellistream.github.io/parallel-computing-course-java-demos/main.pdf](https://intellistream.github.io/parallel-computing-course-java-demos/main.pdf)
+- Slides landing page: [https://intellistream.github.io/parallel-computing-course-java-demos/](https://intellistream.github.io/parallel-computing-course-java-demos/)
 - Slides source repo (may be private): [https://github.com/intellistream/parallel-computing-course-java](https://github.com/intellistream/parallel-computing-course-java)
+
+Note: the `gh-pages` branch of this repository is auto-generated by CI from the slides source repo.