[Lazarus] Documentation in Lazarus

[Wolf]

Hi,

What is the smallest, most compact system for software documentation 
that can handle text, graphics, and preferably mathematical formulae as 
well? I am looking for something that can eventually be presented on a 
form, documenting not just what my code does, but, more importantly, the 
"why" arguments that led me to choosing just that algorithm. fpdoc? 
Delphi-Markdown (https://github.com/grahamegrieve/delphi-markdown)? 
AsciiDoc(tor)? OpenDocument format?

wolf