docs: added banner indicating early access

Author: EstoesMoises

docs/src/content/docs/index.mdx

@@ -2,6 +2,9 @@
 title: Welcome to The Stack Overflow for Teams SDK
 description: Build powerful applications with the official Stack Overflow for Teams SDK. Access your team's private knowledge base programmatically.
 template: splash
+banner:
+  content: |
+    This SDK is currently in <strong>Early Access</strong>. New features are actively being developed.
 hero:
   tagline: Start building with the Stack Overflow for Teams API using our official SDK
   image:
@@ -68,4 +71,4 @@ This project is in **early access**, and more language support and features (suc
 
 Our SDK provides a higher-level abstraction for programmatically interacting with Stack Overflow for Teams, removing friction and enabling you to focus on building great experiences for your team.
 
-The SDK goes beyond just API endpoints - it's designed to provide the ideal developer experience with built-in tools, best practices, and comprehensive guidance for building applications that enhance your team's collaborative knowledge sharing.
+The SDK goes beyond just API endpoints - it's designed to provide the ideal developer experience with built-in tools, best practices, and comprehensive guidance for building applications that enhance your team's collaborative knowledge sharing.