fix broken links in how-we-work.md
## How we work
We are a community project and we work as a team.
- - See [CONTRIBUTING.md](CONTRIBUTING.md) for how to contribute
- - See [documentation index](README.md#documentation)
+ - See [CONTRIBUTING.md](../CONTRIBUTING.md) for how to contribute
+ - See [documentation index](../README.md#documentation)
### Getting contributions
