A new pristine checkout of documentation does not build

```shell
git clone https://github.com/documentationjs/documentation.git documentation-upstream
cd documentation-upstream
npm run build
```

```
> documentation@14.0.0 build
> npm run doc

> documentation@14.0.0 doc
> node ./bin/documentation.js build src/index.js -f md --access=public > docs/NODE_API.md

Parsing file /home/mmom/src/documentation-upstream/src/output/html.js: TypeError: src.slice is not a function
```