www/remark42: update to 1.18.0HEADmain

While here, bring the rc script in line with upstream's options:

- Rename remark_disable_fancy_html_formatting to
  remark_disable_fancy_text_formatting; the old name exported a
  variable the server does not read.
- Rename the remark_auth_enable and remark_auth_email_subject
  defaults to remark_auth_email_enable and remark_auth_email_subj,
  the names that are actually exported.
- Add remark_trusted_proxy, remark_auth_ttl_jwt,
  remark_auth_ttl_cookie, remark_auth_send_jwt_header,
  remark_auth_microsoft_tenant, remark_auth_custom_*,
  remark_telegram_api_url and remark_smtp_helo_host.
- Default remark_avatar_uri and remark_ssl_acme_location to the data
  directory instead of a path relative to the working directory.

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