chore(docs): Adding maintenance window for v2 (#30146)

Co-authored-by: Janson Hartliep <janson@gatsbyjs.com>
Co-authored-by: gatsbybot <mathews.kyle+gatsbybot@gmail.com>
Co-authored-by: Lennart <lekoarts@gmail.com>

README.md

@@ -161,7 +161,10 @@ This repository is a [monorepo](https://trunkbaseddevelopment.com/monorepos/) ma
 
 ### Contributing to Gatsby v2
 
-We are currently only accepting bug fixes for Gatsby v2. No new features will be accepted.
+The maintenance window for Gatsby v2 closes on April 1, 2021.
+
+- During this maintenance window, we will continue to address reported bugs in Gatsby v2.
+- After the maintenance window closes, we will only accept critical security updates for Gatsby v2.
 
 ## 📝 License
 

packages/gatsby/README.md

@@ -162,7 +162,10 @@ This repository is a [monorepo](https://trunkbaseddevelopment.com/monorepos/) ma
 
 ### Contributing to Gatsby v2
 
-We are currently only accepting bug fixes for Gatsby v2. No new features will be accepted.
+The maintenance window for Gatsby v2 closes on April 1, 2021.
+
+- During this maintenance window, we will continue to address reported bugs in Gatsby v2.
+- After the maintenance window closes, we will only accept critical security updates for Gatsby v2.
 
 ## 📝 License