Added warnings about how you need to get early access

Author: matt-aitken

docs/v3/introduction.mdx

@@ -3,9 +3,10 @@ title: "Introduction"
 description: "Welcome to the Trigger.dev v3 documentation."
 ---
 
-<Note>
-  Trigger.dev v3 is currently in Developer Preview. Features and improvements are added each week.
-</Note>
+<Warning>
+  The Trigger.dev v3 Developer Preview is currently in invite-only early access. [Sign up here to
+  request access](https://trigger.dev/v3-early-access).
+</Warning>
 
 ## What is Trigger.dev (v3)?
 

docs/v3/quick-start.mdx

@@ -27,7 +27,10 @@ Once you've created an account, follow the steps in the app to:
 1. Complete your account details.
 2. Create your first Organization and Project.
 
-<Info>Make sure you create a "Version 3" project.</Info>
+<Warning>
+  Make sure you create a "Version 3" project. You might need to [request early
+  access](https://trigger.dev/v3-early-access).
+</Warning>
 
 </Step>