Update README.md

Author: seveibar

README.md

@@ -4,6 +4,10 @@
 
 TSCircuit Builder is a Typescript builder pattern for constructing schematic and PCB layouts. `@tscircuit/builder` is an internal module, [use tscircuit tsx instead](https://github.com/tscircuit/tscircuit). The builder is basically "the DOM for building circuits"
 
+> [!WARNING]
+>
+> `@tscircuit/builder` is replaced by `@tscircuit/core`
+
 TSCircuit TSX eventually renders to a builder. The builder will build
 TSCircuit Soup, a JSON output. Soup can be rendered to
 a webpage as either a schematic or PCB layout.
@@ -18,12 +22,6 @@ a webpage as either a schematic or PCB layout.
 > have to do while providing a lot of flexibility for different renderers. It's
 > like the DOM for Circuits.
 
-> [!NOTE]
->
-> `@tscircuit/builder` is going to be replaced by `@tscircuit/core` eventually,
-> the API and types are a bit wrong because it's an old package. Try to use
-> React with tscircuit to avoid building on the builder API (tscircuit React
-> has a much more permanent API)
 
 ## Example