Docs
The package is now mature enough to deserve proper documentation. The docs should consist of:
- quickstart (installation, basic usage)
- cookbook (feature overview, common patterns, edge cases)
- API docs
- contributor's guide

I can't yet decide on the tool to use. Deciding between:
- [Foliant](https://foliant-docs.github.io/docs/)
- writing the docs in the docstring in norm.nim
- [Hastyscribe](https://h3rald.com/hastyscribe/)