Refactor: Move open-source.html scripts into a separate JavaScript file

Description:
Currently, JavaScript code for open-source.html is placed inside the HTML or shared global JS file.
I propose moving it into a dedicated file (open-source.js) and linking it in open-source.html.

Benefits:
	•	Cleaner separation of concerns (HTML, CSS, JS)
	•	Easier debugging and future updates
	•	Better maintainability and scalability