Landing page should only have a mailbox input

[sametcodes]

Currently the application is available to all users and the UX of the site is not working properly. And I believe this causes bad experience for most visitors, and they get lost on the site at some point. I'm planning to keep the project available only for some internal users, and inform the progress of the project with a mail list.

This issue is planning to cut off current OAuth logins to the site, and replacing it with a newsletter mailbox input on the landing page.

I made an update here.