code: def get_nokogiri(path)
      uri = URI.join('https://stellar.mit.edu', path)
      raw_html = @mech.get_file uri
      Nokogiri.HTML raw_html, uri.to_s
    end
docs: Fetches a page from the Stellar site.
  
   @param [String] path relative URL of the page to be fetched
   @return [Nokogiri::HTML::Document] the desired page, parsed with Nokogiri