Should I use the accordion with long text?

We design the help centre for our product. We have an idea to put each long articles, instructions and the form to leave feedback to accordions. Will be it convenient for users? I think that if there are a lot of accordions with long articles, it will confuse the user.

Should it be a classical article on each page with a menu on left or right hand with breadcrumbs?

The mockup is the below