function getAndRemoveDocsifyIgnoreConfig(content = '') {
  let ignoreAllSubs, ignoreSubHeading;
  if (/<!-- {docsify-ignore} -->/g.test(content)) {
    content = content.replace('<!-- {docsify-ignore} -->', '');
    ignoreSubHeading = true;
  }

  if (/{docsify-ignore}/g.test(content)) {
    content = content.replace('{docsify-ignore}', '');
    ignoreSubHeading = true;
  }

  if (/<!-- {docsify-ignore-all} -->/g.test(content)) {
    content = content.replace('<!-- {docsify-ignore-all} -->', '');
    ignoreAllSubs = true;
  }

  if (/{docsify-ignore-all}/g.test(content)) {
    content = content.replace('{docsify-ignore-all}', '');
    ignoreAllSubs = true;
  }

  return { content, ignoreAllSubs, ignoreSubHeading };
}
Remove the docsifyIgnore configs and return the str
@param {string}   content   The string to deal with.

@return {{content: string, ignoreAllSubs: boolean, ignoreSubHeading: boolean}} The string after delete the docsifyIgnore configs, and whether to ignore some or all.