Hi @abmayfield,
That is probably going to be a little tricky. Those files aren't really constructed for easy copy/paste of just the graph to be embedded in a website. Do you have some experience with html, css, and JavaScript? I haven't put any JMP graphs on a website, but I exported a Graph Builder example to see how it's all structured. All of the action happens within the <head> tags. The actual DOM is just the head tags, which contain the CSS and JavaScript, and empty <body> tags. The JavaScript inserts all of the content into the <body> tags.
If you want to give it a go, I would recommend clipping out everything within the <style> tags and putting that into a CSS file, and then clipping out all the JavaScript in the <script> tags and saving that as a .js file. I don't use foursquare, but I found this which may be helpful for adding your own custom CSS and Javascript: https://support.squarespace.com/hc/en-us/articles/205815928-Adding-custom-HTML-CSS-and-JavaScript
The JavaScript is pretty unreadable in its unformatted state. I'm guessing it is ending up in the footer because the JavaScript just appends the content to the <body> tag, so it will go right at the end. You could add a <div> to the body and edit the JavaScript to to write to that div instead.
Also, I'm sure there will be some conflicts with the CSS that JMP provides with your website's own styling, so that may have some unintended consequences. If you know what you're doing, you can probably sort that out.
Good luck!
-- Cameron Willden