style: docs/ polish

[hunger]

Description

Just a bit of polish for the docs.

• Split up long lines
• Always have a something go along with environment (e.g. "installation environment" or "environment variable")
  • Undo that again in a follow up change: It feels wrong now that I actually did it ;-)
• Remove duplicate "Install" instructions from the home page
• Reword a few small things
• Add a few newlines (where IIRC they are required for strict markdown conformance)

How Has This Been Tested?

by rebuilding the docs using pixi r docs

AI Disclosure

• This PR contains AI-generated content.

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added sufficient tests to cover my changes.
• I have verified that changes that would impact the JSON schema have been made in schema/model.py.

[ruben-arts]

Thank you, lots of improvements. I've left two suggestions, hopefully those clearify the function even more. Let me know when they don't

[ruben-arts]

Thank you