remove docgen remnants from repo, update CHANGELOG

utils/apidoc/mdn/obsolete.json

Index: utils/apidoc/mdn/obsolete.json
diff --git a/utils/apidoc/mdn/obsolete.json b/utils/apidoc/mdn/obsolete.json
deleted file mode 100644
index 48a8f5d69b62d193a7a36f20e9d414e9381fb6ac..0000000000000000000000000000000000000000
--- a/utils/apidoc/mdn/obsolete.json
+++ /dev/null
@@ -1 +0,0 @@
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