Second milestone

Questions - view, CRUD, types (open, closed), filtering
Sharing session (link, code, QR)
Sending quiz (choose: quiz, time, students)
Socket improvement
Reactions (front and back not connected)
Messages from students (front and back not connected)
Solving quiz (front and back not connected)
Feedback at student (front and back not connected)
Statistics (front and back not connected)
Title and icon
HTTP and websocket servers on deno
Heroku deployment

First milestone

Added basic functionality of lecturer and student websites - creating session, connecting to session, questions and quiz view.