Refactor lou_course_descriptions.py to read from local HTML file

- ADDED code to open and read from a local "page.html" file instead of fetching HTML via urllib.
- REMOVED the line that fetched HTML directly from the web using urllib.request.urlopen.
- This change facilitates offline processing and testing by relying on a saved HTML snapshot.

Signed-off-by: Leonid Petrov <lenia.petrov@gmail.com>

Author: lenis2000