Advice generator app (MVC architecture, ES6 classes and modules)

I do not have any questions but I must say that I learned quite a lot with this project.

A couple of things I learned are

1. How to work with ES6 classes and modules
2. How to work with a zero configuration build tool such as Parcel
3. How to implement the MVC (model-view-controller) architecture in JavaScript
4. How to implement the Publisher-Subscriber pattern
5. How to write documentation for functions
6. How to implement a project configuration file and use it throughout the project

Another thing I created as well is a flowchart. This is something I learned from a previous course I followed on Udemy (so I decided to create one on my own this time).

Feedback on the implementation of the MVC architecture as the error handling is welcome.

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As a sidenote: as soon as the user presses the button, the button disables for 2 seconds. The API returns the same advice within that time period and this might confuse the user if the user presses the button again.