[Feature] Use WebSockets for live content synchronisation

[jaktestowac]

WebSockets allow to live content update and can replace API polling.

Where:
tic-tac-toe.html can have two versions with/without WebSockets.
Users can check how given approach is resolved in devtools.
Any other places where extensive API polling occur should be considered to be changed to WS usage.

Risks:

1. Providing backward compatibility. Some areas of applications what can benefit form WS implementation need to be check if this change do not introduce some changes in other testing areas.
2. Research is needed if WebSockets will work on deployment platforms