I think you're overcomplicating it. I assume you created this markdown file and I assume you have a preview render that shows it the way you like it to be shown. So just hit the print button, and in the print dialog select save as PDF.
Google\ Chrome --no-sandbox --headless --print-to-pdf-no-header --no-pdf-header-footer --enable-logging=stderr --log-level=2 --in-process-gpu --disable-gpu --print-to-pdf=resume.pdf "file://path/to/resume.html"