This adds notes on configuring the new `.well-known` setting to require Element users to set up secure backup before continuing into the app. Part of https://github.com/vector-im/element-web/issues/14954
This adds notes on configuring the new `.well-known` setting to require Element users to set up secure backup before continuing into the app. Part of https://github.com/vector-im/element-web/issues/14954