I'm trying to embed the map tour I made into my website, but I'm getting the following screen.

I've tried adding in iframe to the index.html, but I'm new to html/css/javascript, so it's likely I've put it in incorrectly. I've basically scanned articles like these and copy and pasted in the iframe code- Embedding Story Maps in websites and blogs | ArcGIS Blog . Also think I might be having file structure issues.
This is my repo on github, if that helps. I've copied index.html into because that will be the map page- elpinguinodev.github.io/elpinguinodev.github/io/_pages/map.md.
I am new to all of this, so do not be afraid to ask the obvious questions.
Lindsay