I understand that .htaccess is not supported by GitHub Pages. Is there an alternative for password-protecting particular directories for websites hosted by GitH
"Unfortunately, GitHub pages only supports static pages. There is no way to make it execute server-side code and thus it's impossible to protect your pages with any kind of authentication scheme. If you expand further on why you need to password-protect your pages, maybe I can help you find a workaround."
Source: https://webapps.stackexchange.com/questions/35692/is-there-an-alternative-to-using-htaccess-to-password-protect-subdirectories-in