formR documentation request: items, classes, css code

[selinakreinhard]

I think the formr documentation could be improved by providing all users with additional items and classes that were implemented in formr after the last documentation update (referring to https://formr.org/public/documentation#sample_survey_sheet and https://formr.org/public/documentation#available_items)

items:

• some item types are missing e.g. image & file

classes

• some classes are missing e.g. padding classes
• for some classes not all preset values are shown e.g. for right classes preset values from 100 to 900 are included, values from 20 to 80 are not
• some classes are shortened and are less readable e.g. rotate_lab... instead of rotate_label30

Additionally, I feel my ability to customize existing classes and create new ones greatly improved after I learned where to look in formr's code (https://github.com/rubenarslan/formr.org/blob/master/webroot/assets/common/css/custom_item_classes.css), so I think this should be mentioned somewhere in the documentation, too.