Oh good. It would be nice, then, if ‘Get Started’ → ‘Installation’ pointed to that page.
… and yeah, inspired by your response, I went looking further and finally found my way to the page you mention, going ‘Support’ → ‘Documentation’ → ‘Developer’ (!!!) → ‘Installing Concrete CMS’. That’s not a very intuitive path to find those instructions.
There were a few links which broke as we were updating the branding on all the documentation pages (which caused some URL slugs to change), but they should all be fixed now. If you notice any other broken links, let me know.