User:Auldrick/Rewrite Add-on

Add-on needs to be rewritten as an introductory article describing what an add-on is, what kinds of add-ons there are, and what they can be used for. As a starting point, we can use the lede paragraphs of the article, but most of the article consists of links to obsolete documentation that we will be deleting. We can replace it with links to Resource Pack, Behavior Pack, Skin Pack, and maybe World Template.