If it is possible how would I do it? To elaborate I mean a page which requires a password and once you enter it the page is redirected to the website.
I am currently hosting and working on the website on GitHub pages. Would it work here?
Yes, it is possible to create a page that requires a password to redirect to another website. However, you'd better consider something, especially when hosting on GitHub Pages. The password can be easily found by viewing the page source or inspecting the network requests. Anyone can share the direct URL of the target site, bypassing the password protection. If you need more robust security, consider using a hosting service that supports server-side code or using a web framework that provides built-in authentication and authorization features.