update link to twitterisgoinggreat.com, site is dead now

fixes #1881

templates/about.html

@@ -244,7 +244,7 @@
 
 <li id="rip-twitter" class="question">What happened to Twitter?</li>
 <li class="answer">
-<p><a href="https://twitterisgoinggreat.com/">Twitter is burning</a>, <a href="https://www.reuters.com/technology/twitter-makes-first-interest-payment-musk-buyout-debt-bloomberg-news-2023-01-30/">a billionaire owes money</a>, <a href="https://twittercommunity.com/t/announcing-new-access-tiers-for-the-twitter-api/188728">an API got lobotomized</a>, and <a href="https://snarfed.org/2023-04-03_so-long-twitter-api-and-thanks-for-all-the-fish">Bridgy's Twitter support was one of the casualties.</a> Our access was unceremoniously suspended on April 4, 2023, along with many others. So long, and thanks for all the fish!</p>
+<p><a href="https://en.wikipedia.org/wiki/Twitter,_Inc.#Post-acquisition">Twitter is burning</a>, <a href="https://www.reuters.com/technology/twitter-makes-first-interest-payment-musk-buyout-debt-bloomberg-news-2023-01-30/">a billionaire owes money</a>, <a href="https://twittercommunity.com/t/announcing-new-access-tiers-for-the-twitter-api/188728">an API got lobotomized</a>, and <a href="https://snarfed.org/2023-04-03_so-long-twitter-api-and-thanks-for-all-the-fish">Bridgy's Twitter support was one of the casualties.</a> Our access was unceremoniously suspended on April 4, 2023, along with many others. So long, and thanks for all the fish!</p>
 </li>
 
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