support: add test data in sql script
docs: add link to demo images
feature: generate element by not static method
feature: change title max length
feature: many changes

 - Add try/catch for bad element render
 - Optimized get items operator
 - Add bg color for changed element
 - Add params in config for test elements
 - Validate empty param field
 - Init current elements values in data param in JS
 - Add read params for element from request