chore: Remove 16+ unused dependencies (#4910)

* chore: Remove no-longer used webpack loaders

* chore: Remove migration of markdown from Slate documents (2y old)

* chore: Remove more unused deps

* chore: Remove explicit core-js dep

* Remove more unused dependencies

* test

server/presenters/document.ts

@@ -15,7 +15,6 @@ async function presentDocument(
     isPublic: false,
     ...options,
   };
-  await document.migrateVersion();
   const text = options.isPublic
     ? await DocumentHelper.attachmentsToSignedUrls(
         document.text,