inputPath in Config.groovy not taken into account by all tasks

It looks like changing inputPath in Config.groovy does not work. The value of `inputPath` defined in `gradle.properties` is still used by, at least, `exportChangelog` & `exportContributors`

So with a standard template downloaded and unzipped I get errors for `exportChangelog` because it still looks for `src/docs`. I can fix it with something like this in `Config.groovy`:

```
changelog.with {
dir = 'src'
}
```

However, at that point, same issue with `exportContributors`.

The code for my test is in the first commit of this repository: https://github.com/picobank/pico-travel-docs/tree/80d25537b0d88e965b30a502c41df101739a57eb

I'm not blocked, I'm only just doing discovery around docToolchain and it was simpler to just move everything into `src/docs` as expected by the tools. But I thought I might give you some feedback.