fixes names and paths of categories
refactors category inputs and links to be generated from constant
check category boxes if provided in params
ignore age range if at max
enables organisation name searching
fixes name of category params to work with api
clarifies lack of results message
enables filtering by weekdays and highlights searched from params
corrects weekday param values and adds weekdays to no results messsage
handle age range params and no results message
make sure params are set to input values