renamed src to the appropriate module name as to not cause confusion

[jakob1379]

As mentioned in #164 there are risks in mixing flat and src layout. Sticking to one will improve clarity for future contributors and not cause path confusion or improper imports by tools inferring module names from the src/ folder

[Abe404]

I understand that this is resolved now.

From the article you linked:

/my-monorepo
    /project1
        /src
        /tests
    /project2
        /src
        /tests
    /shared
        /src
    /scripts
    /docs

So in our case we have

/root_painter
    /trainer
        /src
        /tests
    /painter
        /src
        /tests (ok this doesn't exist yet, but we can create it when we
have them)
    /docs

Kind regards,
Abraham