feat(layout): add afterBody

quartz/plugins/transformers/ofm.ts

@@ -2,7 +2,6 @@ import { QuartzTransformerPlugin } from "../types"
 import { Root, Html, BlockContent, DefinitionContent, Paragraph, Code } from "mdast"
 import { Element, Literal, Root as HtmlRoot } from "hast"
 import { ReplaceFunction, findAndReplace as mdastFindReplace } from "mdast-util-find-and-replace"
-import { slug as slugAnchor } from "github-slugger"
 import rehypeRaw from "rehype-raw"
 import { SKIP, visit } from "unist-util-visit"
 import path from "path"