docs + chore: cleanup custom sort ordering for folder + tag listings, add docs

quartz/plugins/emitters/folderPage.tsx

@@ -21,9 +21,11 @@ import { write } from "./helpers"
 import { i18n } from "../../i18n"
 import DepGraph from "../../depgraph"
 
-export const FolderPage: QuartzEmitterPlugin<
-  Partial<FullPageLayout> & { sort?: (f1: QuartzPluginData, f2: QuartzPluginData) => number }
-> = (userOpts) => {
+interface FolderPageOptions extends FullPageLayout {
+  sort?: (f1: QuartzPluginData, f2: QuartzPluginData) => number
+}
+
+export const FolderPage: QuartzEmitterPlugin<Partial<FolderPageOptions>> = (userOpts) => {
   const opts: FullPageLayout = {
     ...sharedPageComponents,
     ...defaultListPageLayout,