… in Form macro confirming use of custom config is correctly placed

…ith a custom Default implementation which correctly uses custom field config values provided through the Form macro

…d::try_from_signal when the current value was equivalent to the initial value -- fixes bug which skipped serializing optional form fields into local storage

…tial_value used to be used when computing <Option<..> as FormField<..>>::try_from_signal

…al value is set

has_changed now compares the current value to the default value of the internal type of the signal when the initial value in the signal is None
also removed the potentially confusing FormField::is_initial_value method which is no longer used

…h hook behavior

…documentation is building