support optionally not loading model-list.js

To generate interactives.html for static site:

LAB_DISABLE_SHUTTERBUG=true LAB_DISABLE_MODEL_LIST=true  bin/haml -r ./script/setup.rb src/interactives.html.haml public/interactives.html
optionally generate Lab.config.static = true 

LAB_STATIC=true ./script/generate-js-config.rb
static site: hide DataGames and Original Model links
distinguish archived public and static sites

public: <version/index.html
static: <version>.tar.gz