Great to see this course material public. It's a real missed opportunity though to not mention that Galois wrote a lot of it down staying up all night before being shot.
That's a common myth. See this paper referenced in the wikipedia article:
Rothman, Tony (1982). "Genius and Biographers: The Fictionalization of Evariste Galois". The American Mathematical Monthly. 89 (2): 84–106. doi:10.2307/2320923. JSTOR 2320923
Quite the clickbait. You can only access it from the pay site, or unless you can get a school library to access it, which I will do. Only the first page is available free.