🔊(changelog) migrate existing changelog entries to changeset

The entries were dispatched in matching packages, but some of them that
were about the overall monorepo's architecture (like "setup circleci"
were delete thrown away because they were not matching any specific
package.

.changeset/seven-clouds-add.md

@@ -0,0 +1,5 @@
+---
+"@openfun/cunningham-react": minor
+---
+
+Add component's tokens handling