HOWTO Build a health database and FHIR API Server in 15 mins using open source

This is very helpful. I got the server up and running.
But, and this may be a very amateur question, where is the source code that is creating the left menu lising FHIR methods (valueSet, Patient…etc) and where is the code that executes when the page is posted? I’ve searching the code and I can not find it.