I would like to make my current "Site is down for Maintenance" be a landing page that just collects names of visitors and email addresses. I do not want people signing up for memberships/logging in because there is no content on the site yet; I just want them to provide their contact info so I can send out invites to website later once I have content on the site. Is there a way to modify the current landing page so that it is a form that collects email addresses? I provided a screenshot sample of what I am trying to achieve.
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