New useContent composable to store global navigation state. Fixes for Markdown and Canvas

server/api/file/content/[path].get.ts

@@ -50,7 +50,7 @@ export default defineEventHandler(async (e) => {
             content.content = convertFromStorableLinks(content.content);
         }
 
-        return { content: content.content };
+        return content.content;
     }
     
     setResponseStatus(e, 404);