Planning: Organizing docs for dark-next

[StachuDotNet]

This repo, and the resultant docs site, is focused on dark-classic.
We need to make the division between the doc sections a bit more clear, and plan out what docs we want for -next.

Here are some semi-organized thoughts towards such:

• how-to docs
• discussion docs
  • how to write functional programs in darklang
    • immutability, how to model, options/results/howtodo error checking, how to do loopps
  • error handling
  • what typename to use is different places (enum match pattern, )
  • how dark is different from ... + cheatsheet (syntax and semantics)
    • js, ts, python rust
    • elm, ocaml, f#, haskell (less important)
  • how to do json stuff
  • how to do db stuff
• reference docs
  • language
  • for each tool
  • changelog/release notes
  • library docs (e.g. docs.rs)