Add release notes of v3.1.0

Author: doitbot

docs/en/ref/release-notes/v3.1.0.md

@@ -0,0 +1,13 @@
+# Release notes for docupike `v3.1.0`
+
+Release date: 2026-04-09
+
+We're thrilled to announce a new minor release of docupike. Version 3.1.0 includes 12 new or changed features. 5 bugs have been fixed, 1 of them is marked as critical. We encourage you to update to this version as soon as possible.
+
+Before you update please read all notable changes, available at: [`docs.docupike.com`](https://docs.docupike.com/en/ref/changelog.html)
+
+If you have any question about this release our customer support will be happy to help you: [`help@docupike.com`](mailto:help@docupike.com)
+
+Thanks for using docupike as your preferred IT documentation platform and being part of our great and growing community!
+
+– the docupike team