refactored api to use a controller, added slice to reuse code and categories
code format
added dedicated frontend controller, side menu and categories, categories from side menu dont work right now
added slice for menu item rendering
added categories support to frontend
fixed old spelling error, fixed file upload
fixed api authentication, category name positionning and adjustments to json export
added qr support
rename menu item
filter URI params when generating qr code
added propper categories and a bit design on the admin
do not display logout if frontend is not restricted
disabled login on frontend in default db
Update README.md

added update instructions
added copyright to new files
Merge branch 'master' of https://github.com/claudiu-persoiu/Just-Quizzing
added copyright to new files
remove api file and added controller request to index
added update script
update readme with better update instructions