[Doc] Technical documentation about the functionalities
Because even if the source code is pretty clear, if someone wants to run knightools without digging in the code, it could be useful to just describe what every entity does and how it works.
And how the website react to things, like "when you setup an effect in weaponattackeffect, it will be displayed on the page of the weapon under the effects of the attack, a link will be available to the effect". Or how the markdown is processed to create runtime tooltip on the effect, etc.