Important
Document format:
Each document is a markdown file (.md)
Each document has a title, which is the first line of the file, prefixed with a hash (#). This title is a in fact a link to the document with category name as text and category slugified name as target.
Second level headings (##) are used to define calculation methods. The method name is used as text and the method slugified name is used as target.
Whether for the category or its calculation methods, attributes are a third level heading (###) with attribute name as text and attribute value as paragraph below.