add module descriptions and restructure
add module descriptions and restructure

explain most of the remaining modules (with a few exceptions) and restructure the document into thematic subsections with brief descriptions

processing/p5.js,joecridge/p5.js,dhowe/p5.js,joecridge/p5.js,bomoko/p5.js,limzykenneth/p5.js,dhowe/p5.js,bomoko/p5.js,nucliweb/p5.js,nucliweb/p5.js,limzykenneth/p5.js,mlarghydracept/p5.js,mlarghydracept/p5.js,processing/p5.js