Fix tsconfigs structure

[MrBartusek]

Hey! The current config structure you have set up, which is two files tsconfig.server.json and tsconfig.client.json, is horribly bad practice and highly annoying to work with.

These files can't be really detected by vscode and probably other editors

This causes magnitude of issues, my editor was behaving very wierldy with these files, my types just weren't randomly detected. And this is not easily fixable: microsoft/vscode#12463 (comment) ms just say that this is not a good way of doing it

Adding anything relative to them is annoying. If you want to add type roots for types in the server you need to explicitly specify that they are in src/server/types rather than just types in server tsconfig

This pr changes it to two tsconfig.json in server and client directories that depend on main one

[MrBartusek]

Happy second birthday PR #9 🥳

@atlc @przekwas