Added release notes and version entries for 2025.20.1

Author: GitHub Actions

website/blog/2025-05-19-Release-0.md

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+---
+author: meshcloud
+title: Release 2025.20.1
+---
+
+Release period: 2025-05-15 to 2025-05-19
+
+This release includes the following issues:
+* Fix Building Block Definition Creation with Parents
+<!--truncate-->
+
+## Ticket Details
+### Fix Building Block Definition Creation with Parents
+**Audience:** Customer<br>
+
+#### Description
+This fixes a regression that was introduced by the introduction of multi-selection inputs in the last release
+which broke the creation of building block definitions with a parent relationship.
+