Publish back the release notes of 0.1.2

Author: julienrf

docs/sidebar.yml

@@ -188,3 +188,8 @@ subsection:
       - page: internals/type-system.md
       - page: internals/dotty-internals-1-notes.md
       - page: internals/debug-macros.md
+  - title: Release Notes
+    directory: docs/release-notes
+    subsection:
+      - page: release-notes/0.1.2.md
+        hidden: true