Requested feature overview description.
When new user lands on any e621 page for the first time, having landing page with bried explain of the purpose and rules of the website and link to edit the blacklist before entering the website (with help of forum #270435).

This is pretty common with many 18+ websites.

After this, user should not be bothered with this landing page ever again and logged in users should never have this either as they should've read the rules and guidelines during registeration and their blacklist is located elsewhere.

Why would it be useful?
This would make this much clearer for the first time visitor that what they are about to experience with ability to block the content if they so desire. This would act as buffer if someone with no knowledge of us lands on most downvoted explicit image for the first time but also informal of what our actual aim is and what control user has over the content they see.

What part(s) of the site page(s) are affected?

• Any pages that guests can see and/or has visible posts content on them.