How do I add the login form in page.html.twig? I am using a subtheme from the Neato theme (in Drupal 8) and I am customizing page.html.twig.

Yesterday I performed a logout, and now I want to log in again, but the login form has disappeared.

How do I add the login form in page.html.twig? Do I need another html.twig file?
I think your best bet is to go directly to the path '/user' where the login form will be the main contents of the page.