New version from early feedback

From early tests with some users, I've gotten some really good feedback on what to improve in the guide.

The Product Iteration part (Step 3) have been redone to guide entrepreneur to properly build an MVP by prioritizing features according to value vs effort.

The Product Marketing part (Step 4) also received small changes where entrepreneur is ask to also consider the effort required for each marketing channel.

I also managed to figure out how to add an overview page where you can see all details you have filled at a glance. It's organized around the Build-Measure-Learn loop.

The most revealing feedback is that the guide is more like a workbook and would benefit greatly from some sort of supplementary material like a book or a course. I'm planning to run a pilot workshop to figure out what their content should be.