Inconsistancies in documentation

[petrisch]

When dealing with the german translation, I found a few things that are inconsistent even in the english version.

in types_of_data we talk about floats in the first section. Later the term is decimals. From help into decimals I can see, that it's been used quite as a synonym. So I think we could just use decimal and later explain that it's also a float, would that be ok?

Another thing is, that in environement.md are quite a few links to the html file instead of the .md file. Is that on purpose or could it be cleaned up?

[sholderbach]

The preferred way for VuePress is to use relative links to the markdown files. e.g. https://github.com/nushell/nushell.github.io/pull/388/files. Feel free to open a PR