create a manual for each app/tutorial

[floswald]

• we need a doc associated to each app that tells exactly what this is showing
• tutorials should be more self-explanatory, but if there is anything noteworthy, it should go into that document.
• almost like a step-wise guide through the app
• also a recipe of how to use it with students, eg "first explain this, then that, then tell them to clikc here, then there"
• should be put in the same folder as the app
• format? probaly .Rmd so we can include latex easily (and maybe even distribute to students)

[floswald]

order:

1. corr_continuous
2. datasaurus
3. sampling
4. anscombe
5. reg_simple
6. SSR_cone
7. reg_full
8. the rest

[floswald]

first batch is done!