fix: toc for cyrillic and other non-latin alphabets (closes #396)

quartz/plugins/transformers/toc.ts

@@ -2,7 +2,7 @@ import { QuartzTransformerPlugin } from "../types"
 import { Root } from "mdast"
 import { visit } from "unist-util-visit"
 import { toString } from "mdast-util-to-string"
-import { slug as slugAnchor } from "github-slugger"
+import Slugger from "github-slugger"
 
 export interface Options {
   maxDepth: 1 | 2 | 3 | 4 | 5 | 6
@@ -34,6 +34,7 @@ export const TableOfContents: QuartzTransformerPlugin<Partial<Options> | undefin
           return async (tree: Root, file) => {
             const display = file.data.frontmatter?.enableToc ?? opts.showByDefault
             if (display) {
+              const slugAnchor = new Slugger()
               const toc: TocEntry[] = []
               let highestDepth: number = opts.maxDepth
               visit(tree, "heading", (node) => {
@@ -43,7 +44,7 @@ export const TableOfContents: QuartzTransformerPlugin<Partial<Options> | undefin
                   toc.push({
                     depth: node.depth,
                     text,
-                    slug: slugAnchor(text),
+                    slug: slugAnchor.slug(text),
                   })
                 }
               })