Do not generate specific docs if not required by user

Right if we want to disable some functionality, for example disable docs generating for cli apps, we need to pass null as options:
```
await generateDocumentation({
generateCliAppsHelpInReadmeOptions: null,
generateUsageWaysOfNpmCliAppsInMarkdownFormatOptions: null,
})
```

I propose to make it another way: by default they are not generated and if you want to enable them with default options you will use specific options class and its static method default (example is taken from rust often-used concept)