docs: separate walkthrough tutorials from diataxis learning tutorials

[jzaki]

Most flows in the tutorials section can be completed with the reader simply copy/pasting each step.

The Crowdfunding tutorial is designed to teach.
"The first rule of teaching is simply: don’t try to teach. Your job, as a teacher, is to provide the learner with an experience that will allow them to learn. A teacher inevitably feels a kind of anxiety to impart knowledge and understanding, but if you give into it and try to teach by telling and explaining, you will jeopardise the learning experience.

Instead, allow learning to take place, and trust that it will. Give your learner things to do, through which they can learn. Only your pupil can learn." - https://diataxis.fr/tutorials/

This difference in cadence can be communicated by having...

Tutorials:

• Crowdfunding
• Token

Walkthroughs:

• Counter
• Private voting
• accounts
• private/public token