Add note to README

README.md

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 Nota is a language for writing documents, like academic papers and blog posts. The goal of Nota is to **bring documents into the 21st century**.
 
+**Note (2023-10-19): Nota is undergoing a significant rewrite, so this repo will be stale for at least few months. Check back in around Spring 2024!**
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+If you're curious what I've been up to, check out my POPL 2024 paper ["A Core Calculus for Documents"](https://arxiv.org/abs/2310.04368).
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 ## Installation and Usage
 
 For instructions on how to setup and use Nota, visit: https://nota-lang.org/