Update README and workflows for main branch

Author: mjackson

.github/workflows/test.yml

@@ -1,7 +1,7 @@
 name: test
 on:
   push:
-    branches: [dev]
+    branches: [main]
     tags: [v*]
   pull_request:
     types: [opened, synchronize]

.github/workflows/website.yml

@@ -2,10 +2,8 @@ name: website
 
 on:
   push:
-    branches:
-      - dev
-    paths:
-      - docs/**
+    branches: [main]
+    paths: [docs/**]
 
 jobs:
   website:

README.md

@@ -5,11 +5,11 @@
 
 React Router is a lightweight, fully-featured routing library for the [React](https://reactjs.org) JavaScript library. React Router runs everywhere that React runs; on the web, on the server (using node.js), and on React Native.
 
-If you're reading this, you're on the dev branch where we are actively developing the next major version of React Router, version 6. We're really excited about v6 and believe it delivers a lot of improvements over v5, but we do not yet recommend it for use in production. Please wait until we have a stable release before deploying it on your production app.
+**The current stable release of React Router is version 5, which you can find [on the `v5` branch](https://github.com/remix-run/react-router/tree/v5). The current branch you are viewing is for version 6 which is under active development and should be released very soon.**
 
 If you're new to React Router, we recommend you start with [the getting started guide](/docs/getting-started/installation.md).
 
-If you're migrating to v6 from v5 (or v4, which is the same as v5), check out [the migration guide](/docs/guides/migrating-5-to-6.md).
+If you're migrating to v6 from v5 (or v4, which is the same as v5), check out [the migration guide](/docs/guides/migrating-5-to-6.md). If you're migrating from Reach Router, check out [the migration guide for Reach Router](/docs/guides/migrating-reach-to-6.md).
 
 When v6 is stable we will publish the docs on our website.