add helper/solution messages to answers in quizz questions

See merge request joseph.tran/shiny-tutorial!30

fix images path for rendering in learnr tutorial

See merge request !29

use images/ standard folder

fix path to shiny tutorial Rmd

See merge request !28

fix listings

See merge request !27

add SK8 section and fix quizz questions/answers

See merge request !26

fix tutorial path and rename binder badge

See merge request !25

Merge branch 'binder' into dev

# Conflicts:
#	README.md

fix path and rename binder badge

See merge request !24

successful shiny tutorial deployment on binder

See merge request !23

successful shiny tutorial deployement on binder

fall back to binder configuration files at the root, and move shiny tutorial into its own folder and update badge url

use rstudio on binder

use rstudio on binder

See merge request !20

Merge branch 'binder' into dev

# Conflicts:
#	README.md