newsletter: Add a note about Temporal

src/content/newsletters/2024-11-30.mdx

@@ -18,9 +18,14 @@ Ladybird is fully funded through the generous support of companies and individua
 
 We are incredibly grateful for their support. If you're interested in sponsoring the project, please [contact us](mailto:[email protected]).
 
-### Temporal do-over begins
+### Temporal do-over
 
-FIXME
+[Temporal](https://tc39.es/proposal-temporal/docs/) is a proposal to bring a modern and featureful date/time API to the ECMAScript language.
+We implemented this proposal a couple of years ago, but in the time since, the proposal has been refactored substantially, and we had not kept up.
+We decided it would not have been feasible to make our existing implementation fit the rewritten proposal, so we re-implemented it from scratch
+this month.
+
+In doing so, our overall [ECMAScript conformance](https://test262.fyi/#) has risen to 97%, which is the highest of any engine!
 
 ### Individual CSS transform properties