UI fixes to Settings Page

Description

[x] Purple help text is currently under "Data Classification" heading, when it should be under the "Settings" heading
[x] Help text in incorrect it should read "These settings can only be changed before publishing." "Ces paramètres ne peuvent être modifiés qu’avant la publication."
[x] Spacing is inconsistent and too cramped between each section: Data classification, Response delivery option, Purpose and use. Ensure there is a class of "mb-10" between each section.
[x] text correction: Response delivery option should be "Delivery option" "Option de livraison"
[x] text correction: "Retrieve responses within 45 days." should be "GC Forms holds data temporarily for 30 days." "Formulaires GC conserve les données temporairement pour 30 hours."
[x] Bold the line "Help us understand how form responses will be used"
[x] Italics "Administrative purposes," "Non-administrative purposes,"
[x] Alignment of bullets "Personal information used to make a decision about an individual" and hint text is misaligned, try class "ml-12"
[x] Help text for choosing a delivery option is missing
[x] Help text for Administrative purposes reflects information for choosing a delivery option (the current info here should be for the missing help text in the point above^^)

Currently in Staging: