If you have a running Tails stick, you also have an offline copy of Tails webpage.
Whenever you lack an internet connection or there is a sever outage, just click on "Tails documentation". If you have a working internet connection it will try to reach https://tails.boum.org. If you wish to read the offline version, just turn off your internet connection for a moment, or copy the following url into your browser:
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.