README: restore header title

Author: trusktr

README.md

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 ![Image](https://github.com/user-attachments/assets/5a13b45f-4809-4f59-bb6d-b32bab45f78e)
 
+# LUME Kiwi
+
 LUME Kiwi is a fast TypeScript implementation of the [Cassowary constraint
 solving algorithm](<https://en.wikipedia.org/wiki/Cassowary_(software)>), based on the seminal Cassowary paper. Originally created by
 Chris Colbert, it was redesigned from the ground up to be lightweight, fast and