cleanup doc.js for a better export interface

Signed-off-by: ngn <ngn@ngn.tf>

app/src/routes/doc/[name]/+page.server.js

@@ -1,8 +1,7 @@
-import { doc_get } from "$lib/doc";
+import doc from "$lib/doc";
 
 export async function load({ fetch, params }) {
   return {
-    doc: await doc_get(fetch, params.name),
-    error: "",
+    doc: await doc.get(fetch, params.name),
   };
 }