Factor out markdown widget rendering

web/hooks/code_widget.ts

@@ -1,14 +1,11 @@
 import { Hook, Manifest } from "../../plugos/types.ts";
 import { System } from "../../plugos/system.ts";
+import { CodeWidgetCallback } from "$sb/types.ts";
 
 export type CodeWidgetT = {
   codeWidget?: string;
 };
 
-export type CodeWidgetCallback = (
-  bodyText: string,
-) => Promise<{ html: string; script: string }>;
-
 export class CodeWidgetHook implements Hook<CodeWidgetT> {
   codeWidgetCallbacks = new Map<string, CodeWidgetCallback>();