docs: add rewrite notice

README.md

@@ -3,6 +3,17 @@
 
 ## Introduction
 
+<table class="alert-warn" align=center>
+<tr>
+    <td> 🚨 **Alert** 🚨</td>
+    <td>
+      This project will be undergoing a rewrite to make it more feasible to
+      work on certain features. If you want to use this rewrite, use the
+      [`rewrite`](https://github.com/water-sucks/nixos/tree/rewrite) branch.
+    </td>
+</tr>
+</table>
+
 This is a unification of all the different pick NixOS tooling into one executable.
 NixOS has its various tools spread out between several large scripts that have
 become on the verge of unmaintainable. This tool has one goal: to create a modular