Revise CONTRIBUTING.md and add AI policy

CONTRIBUTING.md

@@ -1,11 +1,20 @@
 # Contributing
 
-We are really happy that you want to contribute.
-To help you get started please read this document.
+We are really happy that you want to contribute. To help you get started, please read this document.
 
-## Current tech stack
+## Tooling
 
-We currently moved from Obsidian to plain markdown so there you might encounter
-some artifacts. (Feel free to create a PR).
+Please use [rumdl](https://rumdl.dev) to lint and format your Markdown.
+Also, spell-check your work using something like <https://languagetool.org/>. Both of these are also done in CI.
 
-If possible please use rumdl or similar for uniform markdown formatting.
+## Style
+
+Our docs are supposed to be tutorial-like and beginner-friendly. For technical details, explain them in the glossary at the bottom of a guide
+or link to a source, if the reader wants to go down a rabbit hole that's fine. You are free to use colloquial language if that improves the flow of the text.
+
+## AI policy
+
+Please do not submit AI/LLM-generated writing. LLMs are useful for many thing, writing prose is not one of them.  
+Our docs are written by humans who put a lot of effort into having a nice end result. Many readers can tell if writing was AI-generated and
+that doesn't accurately reflect the time that goes into working on these docs. If we were to just have LLMs write our docs,
+there is little benefit to the reader -- they might as well ask their LLM of choice instead of referring to our resources.