refactor: move emit from callback to helper file function (#704)

* Change emit from callback to helpers file function

* Update docs, remove commented code, improve type sig

quartz/plugins/emitters/contentPage.tsx

@@ -8,6 +8,7 @@ import { FilePath, pathToRoot } from "../../util/path"
 import { defaultContentPageLayout, sharedPageComponents } from "../../../quartz.layout"
 import { Content } from "../../components"
 import chalk from "chalk"
+import { write } from "./helpers"
 
 export const ContentPage: QuartzEmitterPlugin<Partial<FullPageLayout>> = (userOpts) => {
   const opts: FullPageLayout = {
@@ -26,7 +27,7 @@ export const ContentPage: QuartzEmitterPlugin<Partial<FullPageLayout>> = (userOp
     getQuartzComponents() {
       return [Head, Header, Body, ...header, ...beforeBody, pageBody, ...left, ...right, Footer]
     },
-    async emit(ctx, content, resources, emit): Promise<FilePath[]> {
+    async emit(ctx, content, resources): Promise<FilePath[]> {
       const cfg = ctx.cfg.configuration
       const fps: FilePath[] = []
       const allFiles = content.map((c) => c[1].data)
@@ -49,7 +50,8 @@ export const ContentPage: QuartzEmitterPlugin<Partial<FullPageLayout>> = (userOp
         }
 
         const content = renderPage(slug, componentData, opts, externalResources)
-        const fp = await emit({
+        const fp = await write({
+          ctx,
           content,
           slug,
           ext: ".html",