Extract headings from a markdown string.

headings.js

const headings = content
  .split('\n')
  .filter((line) => line.match(/#{1,3}\s/))
  .map((line) => {
    const [, level, title] = line.match(/(#{1,3})\s(.*)/)
    return {
      level: level.length,
      title,
    }
  })