"docusaurus write-heading-ids" generates unsupported ids when titles contain accentuated characters

Have you read the Contributing Guidelines on issues?

[X] I have read the Contributing Guidelines on issues.

Prerequisites

[X] I'm using the latest version of Docusaurus.
[X] I have tried the npm run clear or yarn clear command.
[X] I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
[X] I have tried creating a repro with https://new.docusaurus.io.
[X] I have read the console error message carefully (if applicable).

Description

French is the main language of my docusaurus doc project.

After I use the "write-heading-ids" command, titles containing accents are all messed up when I build the website: see demo, screenshot or public link below.

Reproducible demo

https://stackblitz.com/edit/github-dzapan-b7pzge?file=docs/intro.md

Steps to reproduce

Have a title with an accent in a doc markdown page ("## Développement local")
Use "yarn write-heading-ids . docs" (Id is generated properly: "## Développement local {#développement-local}")
Use "yarn build" (or yarn start)

=> the title is not displayed properly as the whole line is handled as a title (see screenshot or intro.md page in demo).

Expected behavior

Two possibilities: either docusaurus should be able to handle title ids containing accents or the "write-heading-ids" command should replace accentuated characters.

First option would be more consistent, since accentuated characters seem to be supported in slugs.

Actual behavior

Screenshot from 2022-07-04 11-31-08

Your environment

Public site URL: https://doc.bluemind.net/chore/BMD-40/Premiers_pas_avec_BlueMind/Debuter_avec_le_webmail
Docusaurus version used: 2.0.0-beta.21
Environment name and version: Chrome 103, Node.js 17.9
Operating system and version: Debian Sid, Ubuntu 22.04

Self-service

[ ] I'd be willing to fix this bug myself.

facebook / docusaurus