One offer, one page
The page carries a single offer and a single action. No navigation, no second path, no calendar. Visitors leave a number and get called back, which for this clinic converts better than asking a stranger to pick a slot.
Built to ship as one file
A build step inlines the font subset, the logo and the hero into the HTML, so the finished page is a single self-contained file. A second output is generated for a GoHighLevel custom-code block, which is where it actually runs.
Everything a non-developer needs to change lives in one config block at the bottom of the source. Nothing else needs touching.