Doc: Building the offline app

[MFHSchool]

Describe the solution you'd like As I am using a modified code for a more locked down editor, i am not able to use the available offline app. I would like a documentation of the process to build the offline app, so that I can build my own offline app.

Describe alternatives you've considered Running a local server is possible. But the WebUSB connection is a lot more instable in the browser than with the offline app.