Instead of throwing, return `null` because that means we have a
new doc in our versioning sequence
(Also, cleaned up a bit of code as I researched this)
Partial Fix To #450
* Add Prettier formatting to source files and example files, and check that Prettier formatting is maintained on PRs
* Remove trailing-comma as we are using Node 6 on Circle
* Use latest Node 6 LTS version in Circle
* Remove unused test
e.g.,
The default is
`docs/*.md`
This allows
`docs/somedir/*.md`
or
`docs/somedir/anotherdir/*.md`
Notes:
- All URLs are still /docs/*.html (i.e. the subpath does not get preserved in the link).
- Files in `translated_docs`, if any, will still only be one level
- This should not affect translations or versioning
