Update docs

[jorisbontje]

In order to update https://bluenote10.github.io/NimData/nimdata.html I tried running build_docs.sh, but ran into the following Nim doc gen issues:

• nim doc2 ignores --docSeeSrcUrl parameter nim-lang/Nim#6071
• The file 'dochack.js' not generated with the documentation nim-lang/Nim#8952
• nim doc for a multi-module library too complicated nim-lang/Nim#9444

The following command is somewhat working, besides the missing dochack.js and with the git.commit hack to inject src/ directory to make github Source links work.

nim doc --project --git.commit:master/src --git.url:https://github.com/bluenote10/NimData -o:./docs/ src/nimdata.nim