Have guidelines/rules in separate markdown files

[RemyDuijkeren]

Would be nice to have guidelines/rules in separate markdown files that start with Frontmatter section, something like:

---
rule_id: 1201
rule_category: class-design
title: Another test rule 
severity: required
publish: true
date: 2020-04-24
---

The website should then combine the guidelines into one page per category (Vue-component).

This way rules can be edit individually, but are grouped on the website.