Upgrade rehype, remark, and related dependencies

[brookslybrand]

The following packages needed to be bumped to the latest major versions:

• rehype-autolink-headings
• rehype-slug
• rehype-stringify
• remark-gfm
• remark-html
• remark-parse
• remark-rehype
• unified
• unist-util-visit

I upgraded them, deployed, and everything seemed to work fine. However, I got some type errors and am not familiar enough with these packages or the setup to quickly fix it. I figured this might be an issue someone else would be eager to dig their hands into

[brookslybrand]

Fun little script ChatGPT helped me write to test the difference between pages on prod and staging

#!/bin/bash

# Set the default URL page
url_page=${1:-""}

# Curl the websites, pass the output through prettier, and save to files
curl -s "https://remix.run/$url_page" | npx prettier --parser html > remix.html
curl -s "https://remixdotrunstage.fly.dev/$url_page" | npx prettier --parser html > remix-stage.html

# Diff the two files
diff --color=always remix.html remix-stage.html

Usage

./check-stage docs/en/main/start/v2