Update quickstart to install react@18/express@4

Author: brophdawg11

docs/start/quickstart.md

@@ -27,7 +27,7 @@ cd my-remix-app
 npm init -y
 
 # install runtime dependencies
-npm i @remix-run/node @remix-run/react @remix-run/serve isbot@4 react react-dom
+npm i @remix-run/node @remix-run/react @remix-run/serve isbot@4 react@18 react-dom@18
 
 # install dev dependencies
 npm i -D @remix-run/dev vite
@@ -139,7 +139,7 @@ Just for kicks, let's stop using `remix-serve` and use express instead.
 👉 **Install Express, the Remix Express adapter, and [cross-env] for running in production mode**
 
 ```shellscript nonumber
-npm i express @remix-run/express cross-env
+npm i express@4 @remix-run/express cross-env
 
 # not going to use this anymore
 npm uninstall @remix-run/serve